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The Useful Arts; Considered in Connexion with the Applications of Science with Numerous Engravings

The Useful Arts; Considered in Connexion with the Applications of Science with Numerous Engravings


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1840 Excerpt: ...to the place of its connexion with the verge. Now, by altering the position of the index, this acting length can be regulated, at pleasure, to produce such vibration of the balance, as will make the watch keep true time. By shortening the length, the spring becomes more powerful, and returns the balance quicker, so that it will vibrate in less time. This is effected by moving the index towards F. On the other hand, turning the index towards S, lengthens the spring, by which it becomes more delicate, and less powerful, returning the balance slower than before. Many watches, instead of the arc and index, have a circular curb, or regulator, which is turned by a central arbor, to which the watch-key is applied, when it is necessary to move it. Delicate watches have jewelled pivot-holes, for the top and bottom of the verge, to diminish the friction. These jewels are diamonds, rubies, and other stones, which unite great hardness with durability. Each consists of two pieces, one of which has a cylindrical hole drilled through it, to receive the pivot, the other is a flat piece, making the rest, or stop, which forms the bottom of the hole. Both stones are ground circular on the edge, and are fitted and burnished into small brass rings, which are fastened into the bearings, above and below, by two small screws, applied to each. The addition of jewels to a watch is a great advantage, as they do not tend to thicken the oil, which brass is apt to do, in consequence of the oxidation of the metal. Mr. Dent, a lecturer before the Royal Institution, exhibited to his audience, a dissected watch, showing the complicated nature of this little machine. It appears, that the number of pieces, in a complete lever watch, is nine hundred and ninety-two, and the number of separate t...


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Product Details
  • ISBN-13: 9781231113219
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 128
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1231113219
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 240 gr


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The Useful Arts; Considered in Connexion with the Applications of Science with Numerous Engravings
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