A course of experiments in physical measurement (1897)
Whiting, Harold, d. 1895 · Boston, D.C. Heath and Co. · leaf 331
53)and one approximately an octave above or below itare to be mounted, as in Fig. 131, with their prongsat right-angles. The prongs of one fork (J.) are tobe coated with lampblack, except at a small point 300 TIME OF VIBRATION. [Exp. 54. where, by the touch of a pin, the bright metallic sur-face is… … Fig. 131. through the lens. When a violin-bow^ is drawnacross the fork A, the bright spot partaking of thevibration will be apparently extended into a hori-zontal line, Fig. 132.
Physics
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