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	<title>Your Dream Watch</title>
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	<description>Find the watch of your dreams</description>
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		<title>Men’s Wristwatches Today</title>
		<link>http://yourdreamwatch.com/2011/09/men%e2%80%99s-wristwatches-today/</link>
		<comments>http://yourdreamwatch.com/2011/09/men%e2%80%99s-wristwatches-today/#comments</comments>
		<pubDate>Tue, 20 Sep 2011 00:58:38 +0000</pubDate>
		<dc:creator>jimhuin</dc:creator>
				<category><![CDATA[mens]]></category>

		<guid isPermaLink="false">http://yourdreamwatch.com/?p=64</guid>
		<description><![CDATA[In the age of cellphones, smartphones and the myriad of other gadgets, men's wrist watches might be forgotten, when women are thinking of a great gift. This very fact makes them a unique gift. Watches can still be an important accessory for men, and the unique technology of today's watches makes them unique gifts. And <a href="http://yourdreamwatch.com/2011/09/men%e2%80%99s-wristwatches-today/"> read more <span class="meta-nav">&#187;</span></a>]]></description>
			<content:encoded><![CDATA[<p> In the age of cellphones, smartphones and the myriad of other gadgets, men's wrist watches might be forgotten, when women are thinking of a great gift. This very fact makes them a unique gift. Watches can still be an important accessory for men, and the unique technology of today's watches makes them unique gifts. And if watches are good enough for Eli Manning and Tiger Woods, they ought to be good enough for the rest of us.
	</p>
<p>
	Here's a look at what some of the leaders in the watch industry today are offering.
	</p>
<p>
	<!-- img src="images/stories/watch_pics/citizen-eco-watch.png" alt="citizen-eco-watch.png" title="citizen-eco-watch.png" style="float: right; margin: 5px" height="140" width="94" / -->Citizen men's watches have always been at the forefront of men's fashion.The Citizen Eco-Drive is the latest demonstration of the company's ability to remain ahead of the curve in technology. This is a men's watch that never needs a battery as it runs on light from the sun or from any other light source. The ad campaign features Eli Manning, focusing on the notion that both Manning and this watch are &quot;unstoppable.&quot;
	</p>
<p>
	You can find the latest Citizen men's watches &ndash; including the EcoDrive in our <a href="http://www.yourdreamwatch.com">online watch store</a>. While the suggested retail price is $547 you can find it for much cheaper at our page of <a href="mens/citizen">Citizen men's watches</a>. </p>
<p>
	<!-- a href="mens/nike"><img src="images/stories/watch_pics/nike-lance-armstrong.png" alt="nike-lance-armstrong.png" title="nike-lance-armstrong.png" style="float: left; margin: 5px" height="151" width="135" / -->Mens Nike Watches</a> are always popular with the sports crowd. Take, for example, the Nike Oregon Series Lance Armstrong 4 Men's Watch. This watch revises the notion of sleek in its integration of metal, titanium and thermoplastics. It features some very neat gadgetry as well, including a digital compass that updates direction as you move, an altimeter that presents accurate position fix in your relation to sea level, five interval timers with four time alarms and... a freakin' barometer! For the outdoor sportsman this is just a bunch of stuff you can't get in a smartphone. And here, it's all waterproof, too, of course.
	</p>
<p>
	<a href="mens/bertolucci">Bertolucci men's watches</a> are lesser known, but this brand combines tradition with contemporary elegance. These are men's fashion watches priced in the category of I-definitely-care-about-you. However, you don't have to pay a premium price for these. In our store we've seen deals as amazing as this one captured here, a $5000 watch with a buy it now price of $1265.
	</p>
<p>
	<!--  img src="images/stories/watch_pics/bertolucci-watch-cheap.png" alt="bertolucci-watch-cheap.png" title="bertolucci-watch-cheap.png" style="float: left; margin: 5px; width: 459px; height: 173px" height="173" width="459" / -->
	</p>
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      <a href="http://yourdreamwatch.com/item-new-brand-golden-pattern-skeleton-mens-luxury-square-leather-wristwatch-elegant_390420682121_US.html" rel="nofollow"><strong>New Brand Golden Pattern Skeleton Mens Luxury Square Leather Wristwatch Elegant</strong></a><br />
      <img src="http://yourdreamwatch.com/images/pp.gif" alt="Paypal" />&nbsp;&nbsp;&nbsp;US $2.19
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      <a href="http://yourdreamwatch.com/item-new-gold-colors-mens-luxury-quartz-watch-wholesale_320907496090_US.html" rel="nofollow"><strong>New Gold colors Mens Luxury Quartz Watch Wholesale</strong></a><br />
      <img src="http://yourdreamwatch.com/images/pp.gif" alt="Paypal" />&nbsp;&nbsp;&nbsp;US $2.14
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		<title>Luxury Watches</title>
		<link>http://yourdreamwatch.com/2010/09/luxury-watches/</link>
		<comments>http://yourdreamwatch.com/2010/09/luxury-watches/#comments</comments>
		<pubDate>Tue, 21 Sep 2010 00:21:25 +0000</pubDate>
		<dc:creator>jimhuin</dc:creator>
				<category><![CDATA[mens]]></category>

		<guid isPermaLink="false">http://yourdreamwatch.com/?p=78</guid>
		<description><![CDATA[Luxury watches are a fascinating niche in the world of consumer products. This captivating corner of the world ranges from colorful new designs by Jacob &#38; Company and Joe Rodeo, to the stunning intricacy of Christiaan van der Klauuw's masterful astrolabia and planetaria, to classic luxury from Rolex or Movado through fashion pieces by Cartier <a href="http://yourdreamwatch.com/2010/09/luxury-watches/"> read more <span class="meta-nav">&#187;</span></a>]]></description>
			<content:encoded><![CDATA[<p>Luxury watches are a fascinating niche in the world of consumer products. This captivating corner of the world ranges from colorful new designs by Jacob &amp; Company and Joe Rodeo, to the stunning intricacy of Christiaan van der Klauuw's masterful astrolabia and planetaria, to classic luxury from Rolex or Movado through fashion pieces by Cartier and the like, to legendary timepieces by Genevan legends like Patek Philippe, Tissot, Jaeger LeCoultre... with so many others in between. From my earliest days as the website editor of another website on luxury watches, I have found this corner of the world to be both alluring and astonishingly storied.</p>
<p>As the new owner of yourdreamwatch.com, I plan on revising this site into a smart, savvy portal on the world of fine watches. We'll learn more about movements, deals, news from the world of luxury designers, changes in the industry and changes in watch history. I hope you'll learn why you want to become a collector of luxury timepieces.</p>
<p>First allow me to take a brief stroll down memory lane to tell you about just two of the most fascinating watchmakers I remember from my first foray into the world of luxury watches and timepieces.</p>
<p><strong>Alain Silberstein</strong> is one of the more playful designers in the history of watchmaking. In fact, it could probably be easily argued that his work is made possible only by the playfulness that marked much of 20th century pop art. Let's look at one of his models.</p>
<p><img class="alignright" style="margin-top: 5px; margin-bottom: 5px; width: 96px; height: 105px; padding-left: 5px;" title="alain-silberstein-bolido.jpg" src="http://yourdreamwatch.com/images/stories/watch_pics/alain-silberstein-bolido.jpg" alt="alain-silberstein-bolido.jpg" width="96" height="105" /></p>
<p>The Bolido Krono is actually one of his more muted designs. But notice the astonishing use of color in this piece. Thsi set was produced in a limited edition series of 250 pieces. Note the juxtaposition of the primary colors with the stainless steel's greay. The Bolido Krono came with an automatic Swiss FP1185 movement. Primary colors are used to a more striking effect in many of Silberstein's other designs.<br />
One of the most compellingly original watchmakers working today and - I opine - in the world of watchmaking is <strong>Christiaan van der Klaauw</strong>. I once wrote that he has given us a new way of looking at time, even at this stage in our history. This Dutch watchmaker is so much more than a mere horologist. He makes timepieces that reflect the universe. There's no hyperbole in this. Please look around to find more exaamples, but - again as space permits - I can only briefly discuss one pictured here.</p>
<p><img class="alignleft" style="margin: 5px; padding-right: 10px;" title="vander-klaauw-astrolibium.jpg" src="http://yourdreamwatch.com/images/stories/watch_pics/vander-klaauw-astrolibium.jpg" alt="vander-klaauw-astrolibium.jpg" width="139" height="150" />This is his "Astrolibium." Not only does this depict the sun and the planets, but it shows their relative locations. If you don't know about the amazing artistry of Christian vanderKlaauw, you certainly should.</p>
<p>While he is one of the more fascinating, he is only one of many astonishing horologists working in the amazing world of luxury watches. Look for these and other amazing designers in our collections.</p>
<p>Both Silberstein and vanderKlauuw are rareites as are their watches. But if I look around at watches currently found in our collections, I see some of that glimmer of prodigious creativity in the <a href="mens/roger-dubuis.html" target="_self">Roger Dubuis watches</a> here, as well as some of the newer watches by the <a href="mens/audemars-piguet.html" target="_self">legendary Audemars Piguet</a> .</p>
<p>- James</p>
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      <a href="http://yourdreamwatch.com/item-gents-mens-white-face-hollow-watch-automatic-leather-skeleton-blue-rome-num_261027006291_US.html" rel="nofollow"><strong>GENTS MENS WHITE FACE HOLLOW WATCH AUTOMATIC LEATHER SKELETON BLUE ROME NUM</strong></a><br />
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      <a href="http://yourdreamwatch.com/item-diver-30m-diving-digital-analong-white-mens-sport-watch_270980342924_US.html" rel="nofollow"><strong>Diver 30M Diving Digital Analong White Mens Sport Watch</strong></a><br />
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		<title>How to Buy a Watch</title>
		<link>http://yourdreamwatch.com/2010/05/how-to-buy-a-watch/</link>
		<comments>http://yourdreamwatch.com/2010/05/how-to-buy-a-watch/#comments</comments>
		<pubDate>Wed, 19 May 2010 21:42:41 +0000</pubDate>
		<dc:creator>jimhuin</dc:creator>
				<category><![CDATA[Latest]]></category>
		<category><![CDATA[mens]]></category>

		<guid isPermaLink="false">http://yourdreamwatch.com/?p=34</guid>
		<description><![CDATA[GQ has a wonderful article on how to buy a watch. It goes into much more detail than just buying a watch such as a section on classic watches, vintage watches, caring for your watch, etc.. Ever wonder what makes an heirloom watch or why some metal watches can be more expensive than gold or <a href="http://yourdreamwatch.com/2010/05/how-to-buy-a-watch/"> read more <span class="meta-nav">&#187;</span></a>]]></description>
			<content:encoded><![CDATA[<div align="right"><a href="http://men.style.com/gq/fashion/landing?id=content_5588" target="_blank"><img style="margin: 5px; width: 175px; height: 142px;" title="gold_rolex.jpg" src="http://yourdreamwatch.com/images/stories/watch_pics/gold_rolex.jpg" alt="gold_rolex.jpg" width="175" height="142" border="0" align = "right" /></a></div>
<p><strong>GQ has a wonderful article</strong> on how to buy a watch. It goes into much more detail than just buying a watch such as a section on classic watches, vintage watches, caring for your watch, etc.. Ever wonder what makes an heirloom watch or why some metal watches can be more expensive than gold or platinum? I thought this article was very informative, <a href="http://men.style.com/gq/fashion/landing?id=content_5588" target="_blank" style = "text-decoration: none;">check it out!</a>. </p>
<p><strong>GQ recommended watches</strong><br />
<strong>Over the years, GQ has made numerous recommendations</strong> concerning men's watches and watch accessories. You'll find many of them listed in men's watches below. </p>
<p>Have a look at some of the <strong>best watches for men</strong>, acccording to the archives of the iconic men's guide, GQ magazine. In the April 2010 issue of GQ, the magazine looked at ten great gold watches for men under $500. Those watches were <a href = "http://yourdreamwatch.com/mens/pulsar/" target = "_blank">Pulsar</a>, <a href = "http://yourdreamwatch.com/mens/fossil/" target = "_blank">Fossil</a>, <a href = "http://yourdreamwatch.com/mens/timex/" target = "_blank">Timex</a>, <a href = "http://yourdreamwatch.com/mens/seiko/" target = "_blank">Seiko</a>, <a href = "http://yourdreamwatch.com/mens/emporio-armani/" target = "_blank">Emporio Armani</a> and Bulova, Michael Kors and Nixon.</p>
<p>In another <a href = "http://www.gq.com/style/style-guy/accessories/200412/hamilton-watches" target = "_blank">look</a>, GQ's style writer admitted to being shy about recommending brands but admitted an affection for <a href = "http://yourdreamwatch.com/mens/hamilton/">Hamilton watches</a> with a side interest in the very elegant <a href = "http://yourdreamwatch.com/mens/tag-heuer/">TAG Heuer steel bracelet dive watch</a>. Find <strong>other great mens's watches</strong> below.</p>
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		<title>Flies and Flywheels</title>
		<link>http://yourdreamwatch.com/2008/10/flies-and-flywheels/</link>
		<comments>http://yourdreamwatch.com/2008/10/flies-and-flywheels/#comments</comments>
		<pubDate>Sun, 19 Oct 2008 19:23:36 +0000</pubDate>
		<dc:creator>jimhuin</dc:creator>
				<category><![CDATA[watches history]]></category>

		<guid isPermaLink="false">http://yourdreamwatch.com/?p=27</guid>
		<description><![CDATA[The simplest of all the methods of regulating the velocity of the train, and one which certainly existed before De Vick’s time, is the fan fly, or a pair of arms with vanes which are resisted by the air. I think it by no means improbable, though it is never likely to be ascertained now, <a href="http://yourdreamwatch.com/2008/10/flies-and-flywheels/"> read more <span class="meta-nav">&#187;</span></a>]]></description>
			<content:encoded><![CDATA[<p>The simplest of all the methods of regulating the velocity of the train, and one which certainly existed before De Vick’s time, is the fan fly, or a pair of arms with vanes which are resisted by the air. I think it by no means improbable, though it is never likely to be ascertained now, that some of those earlier clocks were trains of wheels with a fly to regulate their velocity, instead of a balance, which De Vick used in his going part, though he had a fly in the striking part, as the earlier English clocks have, and exactly as it is used to this day.</p>
<p>So long as the force and friction of the train are uniform the velocity of the fly will be uniform, as the variation of density of the air is too small to affect it materially; and it should be observed, that a long fly with a rather slow motion is less affected by variations of force than a short and quick one; but as far more accurate methods are now used, it is unnecessary to go further into this.</p>
<p>A fly wheel, which is either a wheel with a heavy rim or a pair of weighted arms at right angles to the axis which carries them, is another method; but not so good, because, not being resisted by the air nearly so much as fans, it is much more affected by a change of force, which in clock work nearly always means a change of friction in the train. It acts simply by its moment of inertia, which is constant, and therefore the velocity cannot be constant if the force varies.</p>
<p>In fact there is theoretically no limit to the velocity of a fly wheel driven by a weight, so long as the weight can go on falling, though practically a terminal velocity is soon reached, when the friction and the increasing resistance of the air balance the force; but of course this balance is disturbed and the velocity changes as soon as the force varies. Conical Pendulum. A pair of weighted arms attached to a revolving vertical axis by horizontal hinges, so that they can fly farther out as they go, will regulate the velocity more completely than a fly wheel or arms rigidly fixed, and still better if it has fans attached to it, but not completely enough to keep it uniform if the force varies much.</p>
<p>They are like the ‘governor’ of a steam engine in appearance, but no further; for the governor arms work a lever which opens more or less of the throttle valve of the steam pipe, according as the engine is going too slow or too fast.</p>
<p>A single ball or pair of balls hung in this way and driven by a clock train form what is called a conical pendulum, because each arm describes a cone, and the time of its revolution may easily be determined as follows, except so far as it is affected by friction and resistance of air:— Let l be the length of each arm, and the angle at which it happens to be inclined to the vertical axis, which of course depends on the rate of revolution or angular velocity, which is usually called !; then the centrifugal force of each ball = !2l sin ; and as that is the force which keeps the balls away from the vertical, it must balance the force which draws them to it, which is g tan (g being the usual symbol for the force of gravity, or twice the number of feet which a body falls in the first second of time, and g in this latitude is 32.2); therefore ! or the angular space moved over by the arms in one</p>
<p align="center">Fig. 5: Revolving Pendulum</p>
<div style="text-align: center;"><img style="margin: 5px; width: 111px; height: 500px;" title="book7.jpg" src="images/stories/book7.jpg" alt="book7.jpg" width="111" height="500" /></div>
<p>second = p g l cos , and the time of a complete revolution through 360 or 2, is 2 ! = 2 pl cos g . If you wish to know what that means in figures, you must express l in feet, as g is, and write the numerical value 3.14159 for , and take the numerical value of cos from a table of sines and cosines; and the result, after extracting the square root and dividing, is the number of seconds in which the revolution is performed. We shall see hereafter that it is just so much less than the time of a common vibrating pendulum of the same length as p cos is less than 1.</p>
<p>And as the cosine varies least when an angle is small, a clock of this kind will go better when the length of the arms and the weight of the balls are such that they make only a small angle with the axis when the clock weight is driving them. But again it must be remembered that these results are very much modified in actual working by the resistance of the air, which acts more strongly on the balls as they fly farther out, and thereby tends to regulate the velocity, as it does with a fan fly.</p>
<p>A clock of this kind is often used to turn the reflectors or coloured lenses of revolving lighthouses, and also for the more accurate purpose of driving large equatorial telescopes, to keep them pointed to a star notwithstanding the revolution of the earth.</p>
<p>For the earth does not move by jerks, as a clock with a vibrating pendulum and escapement necessarily does. A revolving pendulum alone will not do without some contrivance to equalise the force upon it, or to check the pendulum itself by friction.</p>
<p>The simplest form of it is setting the revolving balls within a conical ring, which they can graze slightly, and it is better if they are furnished with slight grazing springs. And if the cone is also made raisable by a handle within reach of the observer, so that he can regulate the friction, probably this is enough in all ordinary cases.</p>
<p>But for telescopes of great importance superior contrivances are used. The chronograph at Greenwich, which drives a barrel covered with paper, on which the times of various observations are pricked by galvanic communication from the observers, is an ordinary clock with a revolving pendulum, driven by an arm which also carries round a kind of spade, dipped a little into an annular trough of water; and the farther out the pendulum swings the deeper it pushes the spade into the water, by a simple lever arrangement which can easily be imagined.</p>
<p>The great equatorial telescope there has a similar pendulum and trough; but besides that, the clock is itself driven by a ‘Barker’s mill,’ or a pair of revolving horizontal arms on a vertical axis, all hollow and receiving water at the top of the axis. The arms have holes near their ends, on opposite sides, and the water flowing out there drives the arms the other way. The pendulum also works a throttle valve as the governor of a steam engine does, and so regulates the flow of water through the mill.</p>
<p>A revolving pendulum may be hung by a single wire, as there is no tendency to twist, and they are so made in bedroom clocks, which have the advantage of being silent.</p>
<p>But it is difficult to get a wire strong enough for a heavy pendulum which would not also be too stiff. The Greenwich ones are hung by a kind of universal joint, made of two pairs of suspension springs in stirrups, set across each other, one turned upwards and the other downwards, with a cross between.</p>
<p>We shall have to notice afterwards some other clocks for this purpose, in which a revolving continuous movement is combined with a vibrating pendulum and escapement; but I must describe escapements first.</p>
<p>It is perhaps worth mentioning that any point in a wheel revolving uniformly has always the same velocity in a horizontal direction as some point in a pendulum which makes a double vibration in the same time as the wheel revolves; and therefore, theoretically, a constant motion of a clocktrain might be got by connecting some point in a 1 sec. pendulum with a pin in a small disc revolving in 2 seconds, by a rod so long as to be practically horizontal. But it would probably be impracticable to keep the force constant enough to give just proper impulse to the pendulum; and if too much was given, there would be a jerk at the end of every beat, and if too little, the pendulum and the clock would stop.</p>
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		<title>Instruments For Measuring Time</title>
		<link>http://yourdreamwatch.com/2008/09/instruments-for-measuring-time/</link>
		<comments>http://yourdreamwatch.com/2008/09/instruments-for-measuring-time/#comments</comments>
		<pubDate>Fri, 19 Sep 2008 18:19:01 +0000</pubDate>
		<dc:creator>jimhuin</dc:creator>
				<category><![CDATA[watches history]]></category>

		<guid isPermaLink="false">http://yourdreamwatch.com/?p=14</guid>
		<description><![CDATA[At the head of these of course stand the oldest of them all, sun-dials. But it would be a waste of time to say much about them, except in the forms in which they may be made subservient to the more useful and accurate machines by which they have been superseded. The principal feature of <a href="http://yourdreamwatch.com/2008/09/instruments-for-measuring-time/"> read more <span class="meta-nav">&#187;</span></a>]]></description>
			<content:encoded><![CDATA[<p>
	At the head of these of course stand the oldest of them all, sun-dials. But it would be a waste of time to say much about them, except in the forms in which they may be made subservient to the more useful and accurate machines by which they have been superseded. The principal feature of all sun-dials which have to indicate other hours besides noon is a gnomon, with a straight edge, or pair of edges, parallel to the earth&rsquo;s axis, and therefore inclined to the horizon at an angle equal to the latitude of the place, with a plate for the gnomon to throw a shadow on.
	</p>
<p>
	Thus an Indian sun-dial has its gnomon nearly level, and it should be elevated above the plate, while a polar one would be quite upright. If the plate of the dial is part of a cylinder of which the gnomon is the axis, all the hour divisions will be equal, but not otherwise. The divisions before and after noon are equal whenever the plate is equally inclined to east and west. Sometimes they are set in other fanciful positions; in whatever position the plate is, the same hour marks are right for all times of the year, if the gnomon is parallel to the earth&rsquo;s axis.
	</p>
<p>
	But all that belongs to the art of dialling, which may be found in any of the encyclop&aelig;dias, and is of no use to us, as sun-dial observations cannot be relied on except when the sun is near the meridian, by reason of refraction which bends the sun&rsquo;s rays. Meridian dial. A solar meridian mark or sun-dial for noon only is intelligible and usable by many persons who cannot or will not undertake sidereal observations, and is so easily made that everybody ought to have one who cares about having accurate time, and has not the means of getting it from some other source.
	</p>
<p>
	The simplest of all ways of fixing such a mark is to set up a plate facing the south with a narrow vertical slit in it, reaching down to the bottom, upon a horizontal slab of smooth stone, and mark the line of brightness on the stone at the time of solar noon by a chronometer or a good watch carrying the time from some accurate source. The best way of making these gnomons is to screw a pair of thin zinc or copper cheeks on a cast iron upright piece, without attempting to make a sufficiently narrow slit in the iron itself.
	</p>
<p>
	It should have a thick polygonal lump at the bottom screwing on to an iron rod or &lsquo;lewis&rsquo; let into the stone, and lead or cement run round it after it is set upright and as near the meridian as possible. The octagon in the drawing shows the shape of this base and the section across the middle of the gnomon. I fixed the first of these, without a chronometer, in the garden of a vicarage near Cambridge in 1838, by the following method; and as it was afterwards tested by Professor Challis and found as right as can be practically observed, the method may be safely followed. AC is the slit, which I have generally had about 9 inches high. About an hour before noon, on a fine day in summer, when the shadow is short enough to lie within the slab, mark with a pencil where the top of the bright line, or centre of the little hole at A falls, say at S, and draw the arc of a circle Ss with radius CS. Mark again two other spots, S' and S&quot;, at about 11.15 and 11.30 a.m., and draw the corresponding arcs, S's' and S&quot;s&quot;.
	</p>
<p>
	Then watch for the times when the end of the bright line again falls on each of the three circles, and mark the places s s' s&quot;. Bisect all the arcs, and if a straight line CB will run through all the bisections, you may be pretty sure that is the true meridian; if not, some mistake has been made, and you must try again another day.
</p>
<p>
	As you will probably begin to fix the slab and gnomon by the compass, it may be as well to mention that the apparent magnetic north in England is about 18 degrees west of real north at present; for it decreases now slightly with time, and is different in different parts of the world.
	</p>
<p>
	<b>The Dipleidoscope</b> is another meridian instrument, which was invented by the late Mr. J. M. Bloxam, a barrister in considerable practice whose name I shall have to mention again with some clock inventions. He took a patent for it (long ago expired) and assigned it to the late Mr. Dent, by whom only they were made. Its name, compounded of double, an image, and to see, indicates the principle of it; because in all positions but one you see a double image of the sun reflected in it; and if it is so fixed that the single image&mdash;i.e. the coincidence of the two&mdash;occurs also of reflecting the sun when it is just too cloudy for a shadow to be distinct, and in fact you can only see it through darkened glass when the sun is bright.
	</p>
<p>
	The instrument consists of three small plates of glass put together at their edges in a brass box about 2 inches wide and high, so as to form a hollow prism of any convenient angle, no precision being necessary in this. ABC in this figure is the section of it at right angles to the axis of the prism. The front glass BC is plain; the other two are blackened behind to form reflectors. But though the front glass is transparent, it also reflects, because there are dark ones behind it. SI and IR1 are sections of the planes of incidence and reflection of the sun&rsquo;s rays from the glass BC, those planes being all parallel to the axis of the prism, which should be approximately parallel to the earth&rsquo;s axis.
	</p>
<p>
	Part of the rays passes through that glass and is reflected by glass AC to AB, and again reflected there and sent through BC to R2. Now let the angle of incidence, and therefore of first reflection at I, be called A-o (A being the angle between the two reflecting glasses), and let the other angles be designated as in the figure. It requires no mathematics beyond the knowledge that the three angles of every triangle = 180 degrees, commonly called x to see that the angle  B = x - (C + A - o) in<br />
	the small triangle near C; and in the one near A,<br />
	Y = n - (A + ) = C - o;<br />
	and in the triangle near B, a = n - (B +<br />
	Y) = x - (B + C - o) = A + o.<br />
	That is to say, the angle , made by the plane of emergence of the twice reflected rays with the front glass, differs from that of the once reflected by 2o.
	</p>
<p>
	Therefore, if the prism is so placed as to make o = 0, which it will be if the angle of incidence = A, the twice reflected rays will come out parallel to the once reflected, and the two images of the sun will coincide. In fixing the instrument however, we have nothing to do with the angles; but simply to adjust it by trial with a chronometer (for it cannot be done without), so that the images do coincide at solar noon. They were at first made so as to be fixtures on the stone where they were set, and so they were always exposed to the weather, and besides, if cemented in wrongly, they were wrong for ever.
	</p>
<p>
	To avoid both these evils, I suggested the making of a brass plate to be fixed on the stone, with a raised slip adjustable by screws, against which the instrument is to be laid closely when used, but at other times it may be kept in the house. Some of them are made to turn on an axis parallel to the earth&rsquo;s axis, and then they can be pres<code>e</code>nted to the sun at other hours besides noon, but only for the given latitude like a sun-dial. Some are made adjustable for latitude also.
	</p>
<p>
	They are moreover made for star observations with the reflectors silvered instead of blackened, on account of the greater feebleness of star light. A table was published to be used with them, showing the time of first and last contact of the two images of the sun for every day in the year, as that observable perhaps more accurately than the time of 	coincidence; at any rate it gives three chances of observation instead of one.
	</p>
<p>
	But many people prefer my meridian slit.
	</p>
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		<title>Pendulum Springs</title>
		<link>http://yourdreamwatch.com/2008/07/pendulum-springs/</link>
		<comments>http://yourdreamwatch.com/2008/07/pendulum-springs/#comments</comments>
		<pubDate>Mon, 21 Jul 2008 00:29:16 +0000</pubDate>
		<dc:creator>jimhuin</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://yourdreamwatch.com/?p=85</guid>
		<description><![CDATA[There should always be a degree plate, with a pointer to it on the pendulum wherever it can be most conveniently seen. The length of 4 (degrees) on the plate is always .07× its distance from the top of the pendulum; and as the only use of the degree plate is to see that the <a href="http://yourdreamwatch.com/2008/07/pendulum-springs/"> read more <span class="meta-nav">&#187;</span></a>]]></description>
			<content:encoded><![CDATA[<p>There should always be a degree plate, with a pointer to it on the pendulum wherever it can be most conveniently seen. The length of 4 (degrees) on the plate is always .07× its distance from the top of the pendulum; and as the only use of the degree plate is to see that the pendulum keeps the same arc, or to see how it varies, no very great accuracy is required in the degrees. Pendulum springs.</p>
<p>—Various opinions have been propounded on the proper strength for them, but none on any solid grounds, and some on altogether mistaken ideas of the duty of the spring. Probably the thinner it is the better, provided it is thick enough not to be bent too sharply or strained by the weight of the pendulum.</p>
<p>Every now and then a clock is troubled with the disease of spring-breaking over and over again. Sometimes this proceeds from the lower edges of the upper chops being left sharp, which in time cut the spring; and perhaps more frequently from some unseen inequality in the fixing; and it is better to let the pendulum hang at first with the lower chops a little loose, and only to screw them up after the pendulum has got a square bearing, and to take care not to put it out in doing so.</p>
<p>It is wonderful how much more trouble people will take to do things wrong than would serve to do them right, and it is almost incredible that some clock-makers send out their best clocks with the lower edges of the upper chops not horizontal but rounded into a circular arc.</p>
<p>The slightest reflection would show anybody that springs so fixed must tend to ‘buckle,’ or bend not in a straight line, at every vibration. And others make the upper chops, which have the strain of vibration, thinner and weaker than the lower ones which have no strain. There should always be a block of wood close under the bob of a heavy pendulum, to prevent the top from breaking the crutch and pallets if it falls from the spring breaking.</p>
<p>A spring does not bend only at one point as a string does; and therefore a pendulum bob hung by a spring does not move exactly in a circle, but in something more like a cycloid described with that radius of curvature, as in fig. 8, p. 23; and it has often been attempted to make springs which would render the pendulum absolutely isochronous for all such arcs as it is likely to swing.</p>
<p>Possibly the thing could be done, if it was worth doing; but both I and some other persons who have spent a great deal of time on experiments have come to the conclusion that it is not, for reasons will appear when we come to consider the effect of the escapement on the time of vibration.</p>
<p>Indeed I may say at once, with respect to the only escapement I have yet described and all others on the recoiling principle, that the circular error, which it is the object of these spring contrivances to correct, is already more than corrected by those escapements: for the clocks never lose, but gain, when the arc of the pendulum increases; so that the circular error is actually useful for counteracting the escapement error, and the clock goes better than it would with a perfect cycloidal pendulum, or any equivalent contrivance.</p>
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		<title>Centre of Oscillation</title>
		<link>http://yourdreamwatch.com/2008/05/centre-of-oscillation/</link>
		<comments>http://yourdreamwatch.com/2008/05/centre-of-oscillation/#comments</comments>
		<pubDate>Wed, 21 May 2008 00:41:14 +0000</pubDate>
		<dc:creator>jimhuin</dc:creator>
				<category><![CDATA[watches history]]></category>

		<guid isPermaLink="false">http://yourdreamwatch.com/?p=96</guid>
		<description><![CDATA[&#8212;It must be remembered that these are only the theoretical lengths of simple pendulums with all the weight concentrated in the centre of the bob, and that this theoretical length by no means coincides with the actual length down to the centre of gravity of the pendulum, but is always longer. This length may properly <a href="http://yourdreamwatch.com/2008/05/centre-of-oscillation/"> read more <span class="meta-nav">&#187;</span></a>]]></description>
			<content:encoded><![CDATA[<p>
	&mdash;It must be remembered that these are only the theoretical lengths of simple pendulums with all the weight concentrated in the centre of the bob, and that this theoretical length by no means coincides with the actual length down to the centre of gravity of the pendulum, but is always longer. This length may properly be called the radius of oscillation, as the lower end of it is always called the centre of oscillation; which is not a fixed point in the body, like the centre of gravity, but a relative one, every axis of suspension having a radius and centre of oscillation of its own.
	</p>
<p>
	It is not always a simple process to calculate this length (which we may as well call l) for any given pendulum as it requires either the integral calculus or some rules deduced from it; but it will be easy to explain the nature and meaning of the quantities on which it depends.
	</p>
<p>
	Let m be the mass of each particle of the pendulum, which in these calculations must not be confounded with the weight, which is written mg (g being the force of gravity), r the distance of m from the axis of suspension, and M the mass of the whole pendulum; then the radius of oscillation = the sum of each particle multiplied into the square of its distance from the axis, divided by the sum of each particle multiplied into its distance simply; that is to say, l = P mr2 P mr (P being used to indicate this kind of summation, which can only be performed by integration).
	</p>
<p>
	The numerator in this fraction is called the moment of inertia of the body with reference to that axis of suspension. Of course there is some quantity k2 which = P mr2 M, and k is then called the radius of gyration for that axis, and Mk2 is obviously the moment of inertia again. In like manner some quantity h =  P mr  M , and h is then the distance of the centre of gravity of the whole pendulum (not of the bob, remember) from the same axis, which is easy enough to find in bodies of the shape commonly used for pendulums. It appears then that the effective length l of a pendulum always = k2 h ; and it is only when the rod is very thin and the bob itself small but heavy, that k and h can be assumed to be even approximately identical, and therefore both = l, as they are in a simple pendulum.
	</p>
<p>
	But it does conveniently happen that the centre of oscillation in small pendulums of the usual forms is generally near the centre of gravity of the bob, and sometimes coincides with it, as we shall see.<br />
	This quantity Mk2, the moment of inertia, always appears in mathematical formulae as the resister of forces of rotation or vibration on an axis, and of all disturbances of such forces after they have set the body in motion, and therefore we see at once why long and heavy pendulums are better than short and light ones.
	</p>
<p>
	There are a few other simple propositions relating to the centre of oscillation and the theory of pendulums, which it will be appropriate to notice here.<br />
	Draw a pendulum of any shape you like, supposed to be vibrating in the plane of the paper, and call its centre of suspension S, and its centre of gravity G, and the distance between them h. All bodies have this property, that their moment of inertia round any axis through G (which we call Mk2 1) is less than round any other axis parallel to that, and we are not concerned with any but parallel axes; and further, if the other axis is distant h from the centre of gravity, the k2 round that new axis = k2 1 + h2.
	</p>
<p>
	Therefore if O, somewhere below G, is the centre of oscillation corresponding to S, l or SO = k2 1+h2 h ; and l &minus; h, or GO = k2 1 SG; or the centres of suspension and of oscillation are reciprocal. In fact, if the pendulum is wide enough, you may draw two circles round G with radii GS and GO, and if you stick an axis through the pendulum, at right angles to the same plane of vibration, anywhere in either of those two circles, it will vibrate in the same time as on the original S.
	</p>
<p>
	Consequently, if you construct a pendulum (symmetrical on both sides of its middle plane of vibration, to prevent it swinging with a twist) with one fixed axis S, and another adjustable one for O, and a movable weight to adjust the time by, you can make it vibrate in the same time on both axes; and by adjusting the movable weight also, the pendulum can be made to agree with the vibrations of a clock pendulum which is beating seconds; and then the distance between S and O, or the two knife edges which represent them, being measured, we shall know that that is the length of the simple seconds pendulum. It has also been proved that if round axes are used instead of knife edges, the distance between them (not their centres) equally represents the radius of oscillation, provided the axes roll on a plane.
	</p>
<p>
	If all the standard yard measures in the kingdom should ever be lost, they could only be restored by this process, according to an Act of Parliament, 5 Geo. IV. c. 74, which declared that a yard is 36 39.1393 of the length of the pendulum which vibrates mean seconds in London at the level of the sea, in a vacuum. The force of gravity decreases so much towards the equator that an English pendulum would lose 21 	4 minutes a day there.<br />
	The following rule for the length of the seconds pendulum in any latitude has been deduced from observation, near enough for all practical purposes: l = (1 &minus; .0027 cos 2 lat.) 39.1156 inches; that number of inches being the length of the pendulum at lat. 45. When the latitude is more than 45, cos 2 lat. becomes &minus;, and so l exceeds its length at 45, as of course it ought to do.
	</p>
<p>
	Another still simpler formula is l = 39.017 [the length of a seconds pendulum at the equator] +.2 sin2 of latitude.
	</p>
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		<title>Balance Wheel Escapements</title>
		<link>http://yourdreamwatch.com/2008/03/balance-wheel-escapements/</link>
		<comments>http://yourdreamwatch.com/2008/03/balance-wheel-escapements/#comments</comments>
		<pubDate>Fri, 21 Mar 2008 00:34:27 +0000</pubDate>
		<dc:creator>jimhuin</dc:creator>
				<category><![CDATA[watches history]]></category>

		<guid isPermaLink="false">http://yourdreamwatch.com/?p=89</guid>
		<description><![CDATA[Before we go into the theory of pendulums we should notice the one other mode of regulating the motion of a clock-train which existed long before pendulums were applied. The earliest escapement of which there is any known description is that which De Vick’s clock had, and which is called the crown-wheel escapement. The object <a href="http://yourdreamwatch.com/2008/03/balance-wheel-escapements/"> read more <span class="meta-nav">&#187;</span></a>]]></description>
			<content:encoded><![CDATA[<p>Before we go into the theory of pendulums we should notice the one other mode of regulating the motion of a clock-train which existed long before pendulums were applied. The earliest escapement of which there is any known description is that which De Vick’s clock had, and which is called the crown-wheel escapement.</p>
<p>The object of that, as of all the later escapements, was to let a tooth of the quickest wheel in the train escape past some stops called pallets at every vibration of the balance, and that wheel is thence called the scape-wheel, and a crown-wheel from its shape. The pallets A, B, in fig. 6, are pieces of steel fixed to the axis or arbor of the balance C </p>
<p align="center">Fig. 6: Balance Wheel Escapement</p>
<p align="center"><img style="margin: 5px; width: 350px; height: 600px;" title="book8.jpg" src="http://yourdreamwatch.com/images/stories/book8.jpg" alt="book8.jpg" width="350" height="600" /></p>
<p>in planes at right angles to each other, one of them set so as to be pushed one way by the front teeth D of the wheel, and the other the other way by the back teeth. As one tooth escapes past its pallet, the other pallet is in a position to receive and stop the opposite tooth. But as the balance has then acquired a swing in the direction in which it has been pushed by the escaping tooth, it does not stop immediately, but swings a little farther and so drives the wheel back again a little, producing what is called the recoil.</p>
<p>This is just the same as the old ‘vertical’ watch escapement, which remained in use until a few years ago, with this important exception, that the time of vibration of a watch balance is regulated by a thin spiral spring fixed to it and to the frame, whereas this had none, and so its regulating power over the train depended solely on its moment of inertia, and on its swinging farther for any increase of force, which by no means makes it isochronous.</p>
<p>The same thing is still to be found in bottle-jacks; the piece of meat to be roasted forms the balance, and the noise at each change of its motion is the ‘ticking’ of the escapement. It is true the meat makes several turns for one tick, while De Vick’s balance made only half a turn, but that is because there is a wheel on the pallet arbor in the jack, worked by a pinion on the meat arbor, as in the rack lever watch escapement; but otherwise the bottle-jack escapement is precisely the same as in De Vick’s clock, in which the axis of the balance was vertical, and not horizontal as in fig. 6.</p>
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		<title>Wristwatch History</title>
		<link>http://yourdreamwatch.com/2008/02/wristwatch-history/</link>
		<comments>http://yourdreamwatch.com/2008/02/wristwatch-history/#comments</comments>
		<pubDate>Thu, 21 Feb 2008 01:03:51 +0000</pubDate>
		<dc:creator>jimhuin</dc:creator>
				<category><![CDATA[watches history]]></category>

		<guid isPermaLink="false">http://yourdreamwatch.com/?p=98</guid>
		<description><![CDATA[Part I, Early Development Curiously, the modern wristwatch is a little more than one hundred years old. Although personal, portable time pieces had been around since the 1400s, they were crafted one at a time and were luxury items produced for the nobility and wealthy. The first known wristwatch was crafted in the 1830s and <a href="http://yourdreamwatch.com/2008/02/wristwatch-history/"> read more <span class="meta-nav">&#187;</span></a>]]></description>
			<content:encoded><![CDATA[<p><strong>Part I, Early Development</strong><br />
   Curiously, the modern wristwatch is a little more than one hundred years old. Although personal, portable time pieces had been around since the 1400s, they were crafted one at a time and were luxury items produced for the nobility and wealthy.  The first known wristwatch was crafted in the 1830s and for the next 70 years, wristwatches were not produced in large quantity. They were thought of as bracelets with a watch attached, the watch being a portion of the adornment and usually not very good at keeping time.</p>
<p>The 19th century was a period of furious innovation and clock making was caught up in all the changes that were occurring world-wide.  The pace of life for many people no longer followed the slower pace of seasonal change and sun-up, sun-down reckoning.  A case in point was a railway collision which killed many dozens because a passenger train was four minutes late; it collided with a freight train head on because it was already supposed to have cleared that section of track.  For railway workers, watches were a very serious necessity. </p>
<p><strong>Part II, Early 20th Century Developments in Watches</strong><br />
The first known design for a man's wristwatch was produced by French jewel house, Cartier.  Cartier had been making women's wristwatches since the 1880's and Louis Cartier was approached by aviation pioneer Alberto Santos-Dumont to create a watch where he could have both hands free for his flying exploits.  Cartier presented him with a watch that was to become the blueprint for watches from that day forward;  designed for the left wrist, stem to the right,  horns for attaching the strap to the watch and a clasp.  Because of Santos-Dumont's international popularity, the trend for men's wristwatches was taking root. </p>
<p>During World War I, radium dials and hands that could be seen at night were developed and hardened mesh covers that helped prevent cracking during military activities.  Waterbury Clock (later Timex) turned out hundreds of thousands of watches by war's end.  Moisture, magnetism, dirt and spring fatigue were still problems that effected durability, but the wrist watch as a general purpose possession for men was established  by the war veterans that continued to wear and demand them. </p>
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