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Scientific American, Vol. 64, No. 11 (1891) (1891)
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fit the threads in the conce.ved por- design, as shown in Fig. 6, being used to facilitate patented by Mr. M. A. Libbey, of South Berwick. tion of the shank, the edge of the thread being milled. making such connection. The electrodes, shown in Me. The improvement provides a power mechanism The nut… … ed to the door jamb. A spring is located with- teries for use, CRISP & WEBB’S ELECTRIC BELT. © 1891 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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