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Home > General > The Electrician and Electrical Engineer Volume 4
The Electrician and Electrical Engineer Volume 4

The Electrician and Electrical Engineer Volume 4


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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. 1885 Excerpt: ...the lamps from the electric circuit when its temperature is too great. The drawing shows a section of the apparatus, in wliich B is the transparent bulb. This bulb is open at the smaller end and the burner d inserted, and the open end of the tube is placed in connection with a mercury vacuumpump, the platina wires g and / passing through. The burner is connected with a battery and variable resistance coil while the vacuum is being made. The heat of the bobbin d is, in the course of one hour, brought gradually from the temperature of the air to vivid incandescence. When the vacuum is considered practically perfect the open end of the tube is melted and sealed. The platina wires passing through the glass are also sealed. Thus I am enabled to obtain a nearly perfect vacuum, which is permanent, and at the stime time give the platinum wire a new and unknown property of great value in electric lighting, which is, that a platina wire which melts in the open air at a point where it emits a light equal to 4 candles will, when operated upon as described, emit a light equal to 25 candles without fusion. The reason why the melting-point of the metal is thus raised is, that in the act of making the vacuum with the metal under heat all the gases which are contained in its pores are withdrawn, and when the receptacle is sealed cannot re-enter when cold; hence unequal and sudden expansions cannot take place and the wire is never cracked, but if loft uncovered becomes as bright as the most polished silver--an appearance which cannot be given it in any other way. On the other hand, it is known that the metals of the platinum group have, in a surprising degree, the peculiar power of absorbing within their pores many volumes of gas, and it is the sudden expansion of this gas u...


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Product Details
  • ISBN-13: 9781236219718
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 650
  • Spine Width: 33 mm
  • Width: 189 mm
  • ISBN-10: 1236219716
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 1143 gr


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