Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 135
ards is jour-naled a wire crank shaft carrying at its forward end a trans-verse wire forming a sort of balance, and serving also as akey for winding. The inner end of the crank shaft is pro-vided with a loop to which are attached rubber bands whichare also secured to a post near the rear end of the… … Mechanical Bird. The rubber bands are twisted by turning the shaft bymeans of the cross wire. When the shaft is released, it isturned by the rubber bands in a reverse direction, causingthe crank to oscillate the wings, which beat the air in anatural manner, and propel the device forward. The…
Physics · Lantern projection · Electric apparatus and appliances
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![An illustration from Travels through the Southern Provinces of the Russian Empire in 1793 and 1794. Translated from the German [by F. W. Blagdon]. MS. notes (1812)](https://img.insideoutlibrary.com/img/200/bl-bl_002753914_2-243-1.webp)
