Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 570
^ % J^ / \ I 2 / \ y \ PERCENT 1 ^GE - -CON posn ION Sn=835 Al=1.28 40 60 Fig. 407. standards and of resistance coils for laboratory or commercialuse. For example, if 12 parts of nickel, 84 parts of copper and 4parts of manganese be mixed together, an alloy called manganinis formed having a… … Fig. 408. 637. Standards of Resistance. Since the comparison of resis-tances can be made much more accurately than that of any otherelectrical quantities, it is very desirable that standards should beavailable which do not changewith time or with change of tem-perature. Such have been madepossible…
Physics
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