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Scientific American, Vol. 57, No. 7 (1887) (1887)
leaf 7
and of break action was essential to its operativeness. The ted with great clearness and delicacy. It is exceedingly its actionsis a shadowy thing at best. It is rather point is also made that spring action interferes with sensitive. The speaker may stand off several feet, with atmatter for… … | keeps jumping. back and forth, rolling up and down the country has ever seen. To regulate the extent of this motion, © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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