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Scientific American, Vol. 57, No. 7 (August 1887) (1887)

leaf 7

An illustration from Scientific American, Vol. 57, No. 7 (August 1887), 1887, leaf 7
ather point is also made that spring action interferes with sensitive. The speaker may stand off several feet, with a matter for scientists to theorize over than for prac- the regularity of the [makes and breaks, which regu- his back turned to it, and it will still transmit all his tical workers to… … © 1887 SCIENTIFIC AMERICAN, INC.

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