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 409
about equal to its own diameter. The scintillation of stars is due to a similar cause. Their apparentdirection and intensity are subject to rapid fluctuations as masses of air ofvarying density drift across the line of sight. 457. Schlieren Method. Many phenomena which are too feebleto be observed… … Fig. 272. screen, a jet of coal gas, hydrogen, or carbon dioxide from the tube Twill cast a clear image on the screen. The difference between the re- REFRACTION PHENOMENA. 393 fractive power of the jet and that of the air will cause an alteration in thedistribution of light on the screen, which…
Physics
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