A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 700
nges, andif the ratio of the frequenciesis not exactly the given frac-tion, then the form slowlychanges from one shape toanother. The three simplestcases of compound vibrationsare given in Fig. 623, thefrequencies being 1:1, 2:1and 3 : 2. Lissajous figures. — Theabove curves may be pro-duced by… … Fig. 621.- -Two vibrations at right angles withfrequencies as 2 : 1. 676 SOUND CHAP. so small that the figures can only be produced on a very small scale.But by attaching a small mirror, such as a galvanometer mirror,to a thin strip of mica fastened to the prong of the forks, as at M1and M2 (Fig.…
Physics
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