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 446
are normally supposed to burn 120grains per hour. In actual practice there are great deviationsfrom uniformity. Other reliable standards are the Methven screen and the Hefner-Alteneck lamp. The former is a gas flame from an Argandburner, the light from which passes through a rectangular open-ing of… … Fig. 315. 430 LIGHT. EMISSION OF RADIANT ENERGY. 490. Analysis of Badiation. The methods by which radiationmay be analyzed by the dispersion of colors, or waves of differentlength, have already been described (§482). The radiation fromall known sources is complex—that is to say, it contains wavesof…
Physics
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