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 265
eating. A finegrating of thin metallic strips or singlestrip of platinum, blackened on the surface,is exposed to radiation. This metallicgrating or strip is placed in one arm of aWheatstone bridge (see Electricity) andthe deflections of the galvanometer in thebridge become a measure of the rise… … Fig. 160. RADIATION. 249 It consists of an exhausted glass vessel, in which a very light horizontalarm, carrying at each end a thin mica plate, is suspended by a quartz fiber.One side of the mica plates is polished, the other blackened. The blackenedface of one of the pieces of mica is opposite and…
Physics
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