A text-book of physics : with sections on the application of physics to physiology and medicine (1902)
Lehfeldt, Robert Alfred, 1868-1927 · London : E. Arnold · leaf 167
d black patch with a pair of arms to itrepresents the two knobs between which the spark took place ;from this the wave will be seen spreading out spherically till(Fig. 52, No. 2) it strikes a flat reflecting surface near the bottomof the figure; by this it is inverted and the reflected portion… … Fig. 53. This point, on which the whole disturbance is for the momentconcentrated, constitutes what, in optics, is known as the focus ;after passing the focus the wave spreads out again spherically RESONANCE 157 (5, 6,7, 8). The end portions of the reflected wave, which areprominent in Nos. 6, 7,…
Physics
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