Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 175
we have cot e = 1, or e = irl4, and a = A v 2 (18). The present case gives rise to a curious phenomenon whichis readily made clear by Fig. 41. 104. Since the forced vibrations start from the undis-placed position it is obvious that 7=0, and from (16)and (17) or (18) in (2) we find that C is… … the resultant motion is represented by the projection onOY of E the moving corner of the parallelogram on OP andOQ. Hence OP has the length A, OE= C=A nearly, andOQ = a = approximately A J2. Further, the angle POX = 8 == 7r/2 nearly, and QOX = e= 7r/4 nearly. The line OE is seento lie on OX, thus…
Sound
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