Mechanical Industries Explained; Showing How Many Useful Arts Are Practised with Illustrations
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Home > Business and Economics > Industry and industrial studies > Mechanical Industries Explained; Showing How Many Useful Arts Are Practised with Illustrations
Mechanical Industries Explained; Showing How Many Useful Arts Are Practised with Illustrations

Mechanical Industries Explained; Showing How Many Useful Arts Are Practised with Illustrations


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About the Book

This historic book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1881. Not illustrated. Excerpt: ... why jewelled holes are employed in drawing very fine wires is because the steel of the draw-plate becomes worn by frequent use, and thus the holes become larger. In cases, therefore, where uniformity of thickness is of importance the wire can only be depended upon when drawn through such hard substances as the ruby, sapphire, or chrysolite. A silver wire i%hs of an inch in diameter has been drawn out to the extent of 170 miles through a perforated ruby. The holes in a draw-plate are made with a conical steel punch, by which they assume a tapering form, the larger opening of which is that through which the wire enters, and which may properly be called the back of the plate. When the draw-plate is fixed in the jaws of a vice secured to a bench the metal to be drawn out is passed through the requisite hole at the back, and the projecting point is then gripped in the pliers, and may, if the metal is soft and thin, be drawn through without very great exertion; but it must be done by a very steady, continuous pull, without the least jerking motion. The counter-sunk hole at the back of the plate facilitates the insertion of the wire. TYPE-FOUNDING. Type-metal is composed of an alloy of lead 3 parts, and antimony 1 part, melted together several times to ensure uniformity. For smaller types a slight increase in the proportion of antimony is sometimes given in order to make the alloy harder. The operation of letter-cutting is conducted somewhat after this fashion: A piece of soft steel of suitable size is taken, and with this the letter-cutter proceeds to form a punch. He first makes a perfectly flat surface on one end, upon which he traces, with ink, or a fine steel point, the form of the letter. He next cuts round the margin of the letter with a graver, and the...


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Product Details
  • ISBN-13: 9781150151590
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 58
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1150151595
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 122 gr


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