Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 666
in contact withthe diaphragm, but when sounds are uttered in the tubeattached to the cell, the diaphragm is vibrated, its motionbeing made manifest by the repeated repulsion of the ball. In Fig. 623 is showm an instrument for tracing upon asmoked glass a record of the movements of the diaphragm.… … Experiment showing the Vibration of a Diaphragm. A wooden frame is supported by a standard secured to thebaseboard. The face of the wooden frame is grooved toreceive the smoked glass plate, which is held in the grooveby four spring clips, so that it may be moved up or downafter each tracing,…
Physics · Lantern projection · Electric apparatus and appliances
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-101-87.webp)
