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 574
-cated by the instrument. When b is so located, then the ratio ofthe fall of potential in Pa to that in aQ is r^: r„ and the ratioof the fall in Pb to that in bO is r^ir,. Hence it follows thatrjr„ = rjr^. In practice rjr^_ is a fixed andknown ratio. If now r, be an unknown re-sistance, the… … T = r Fig. 414. 642. The Platinum Thermometer. The fact thatthe electrical resistance of a pure metal can be ex-pressed as a simple function of its temperature ismade use of in constructing a very accurate ther-mometer for temperatures both above and below theiJ^ limits within which the mercury…
Physics
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