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 371
Fig. 222. l^ATURE OF LIGHT. 355 the tangent surface AB. It is evident from the figure that only thosewavelets between the lines AA and BB conspire in a common wave front.Outside of these lines the wavelets cross each other in all directions andin all possible phases at random, so that the resultant…
Physics
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