Electric Wiring; Theory and Practice, for Wiremen, Engineers and Students, Including Special Chapters on Motor and Dynamo Circuits and Ship Wiring, and Classified Examination Questions in Installation Work

Electric Wiring; Theory and Practice, for Wiremen, Engineers and Students, Including Special Chapters on Motor and Dynamo Circuits and Ship Wiring, and Classified Examination Questions in Installation Work

By (author) 

List price: US$20.12

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks

Description

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. 1920 edition. Excerpt: ...China, and Porcelain are all spendid insulators of the best kind, if made of best quality material. Unfortunately they easily break, and in many cases it is only the surface glaze which renders them such good insulators, so that on being chipped the material absorbs water and loses its insulating properties. Owing to the easy manipulation of the clay any shape or size can be made, so that these materials are largely used for switch bases and covers, ceiling roses, fuse blocks, line insulators, etc. Glass has a great affinity for moisture, and is inclined to chip and crack, although the insulation properties of the best kinds are about ten times that of porcelain. If the air is very dry, as in some parts of America, glass is superior to porcelain for insulators on extra high voltage transmission lines. 300. Asbestos Wood.--This material is mineral in character and is made chiefly from asbestos fibre. In appearance it is like dark oak and can be turned, cut, etc., with the same ease that hard wood can. Its mechanical strength is very great and a slab f in. thick has the same strength as a panel of marble having a thickness of 2 ins. The insulation tests show that it is little affected by water and has a resistance about equal to hard rubber, and very much higher than slate or marble. Owing to its fireproof nature, high insulating properties and great mechanical strength, together with the ease with which it can be worked, it should be used to a large extent in the future for switch bases, dividing fillets, etc., where a substance possessing these qualities is essential. 301. Insulators for Cables. 302. Pure Rubber.--This on exposure soon deteriorates and becomes brittle. On being heated it becomes soft and sticky, and with increase of temperature...show more

Product details

  • Paperback | 110 pages
  • 189 x 246 x 6mm | 213g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236653386
  • 9781236653383