Sound; an elementary text-book for schools and colleges (1922)
Capstick, John Walton · Cambridge [Eng.] University press · leaf 43
t the bobs to such positionsthat the time of swing is the saine for both pendulums. Nowit is clear that E willdescribe some kind of ovalor circular curve. We canshew that a circle is apossible curve. If P travels round thecircle in Fig. 13 with uni-form speed, and PN, PNare the perpendiculars fromP… … 42-43J ELASTICITY AND VIBRATIONS 31 displacement got by compounding OJVand ON by the Paral-lelogram Law. This evidently holds for every position of P,and therefore the motion of P may be regarded as obtainedby compounding the vibrations of N and N. These vibrationshave the same amplitude and…
Sound
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