N«A,C«A» Technical UemorandTm No. 818 Fi2«. 29,31,32.33 Figure 31.- Effect b c njiiimiimiiiummi of initial 89.7 0.33'^•'^'^•'^''^•^^ tension: 395 0.50' a, compar- ison 89.5 0.66 TV'V'V"^ b frequency^ 600/sec. natural spring frequency c per sec. c, play between coils in xzsQ. Tigur9 29.- Stfect of… … Figure 33.- Increase of oscillation amplitude due to play Figure 32.- Comparison of computed spring of roller; a, without play. forces with oscillograms with play of roller varying between 0 and b, with 0.8 am. play U = 17). 0.8 mm. (s = 20).
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