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Home > Art, Film & Photography > Technologic Papers of the Bureau of Standards Volume 161-170
Technologic Papers of the Bureau of Standards Volume 161-170

Technologic Papers of the Bureau of Standards Volume 161-170


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...the cold junction increases, the emf of the couple decreases, but the resistance C increases. An increase in the resistance C tends to increase the deflection of the galvanometer, while a decrease in the emf of the couple tends to decrease the deflection. On account of the fact that the thermoelectric power of a couple and the temperature coefficient of resistance of the coil C are nearly constant or vary similarly with temperature over a small range of temperature, by properly proportioning the various resistances of the circuit the increase in deflection due to an increase in the resistance of C compensates to all practical purposes for the decrease in deflection due to the decrease in emf of the couple as the temperature of the cold junction increases. (/) Methods Employed 1n Correct1ng For Var1at1ons 1n The Temperature-emf Relat1on Of D1fferent Couples Of The Same Type.--Platinum and platinum-rhodium suitable for thermocouples are refined by Engelhard in this country and by Johnson-Matthey in England. The temperature-emf relations for the couples obtained from these two sources differ from each other somewhat, but as stated elsewhere, the reproducibility of either of these general types of Le Chatelier couple is highly satisfactory. Base-metal couples of any given type, however, may produce under the same temperature conditions emfs differing by o to 5 per cent or more. Expressed in temperature, these differences may amount to 500 C at 10000 C. If the manufacturer of the couples exercises special care in the choice of the wire, these differences may be considerably reduced. For example, a certain length of chromel wire and a length of alumel wire may be selected as representative of the standard couple for which the scale of the...


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Product Details
  • ISBN-13: 9781130520910
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 148
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1130520919
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 277 gr


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