Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 152
s cemented at the eye end * See also chapter on projection. SOUND. 129 to the center of a diaphragm by a drop of sealing wax.The mouthpiece is attached to a base supporting the cross-piece upon which the smoked plate is placed. A thin strip of wood fastened by two common pins^oneat each end—serves… … Recorder for Sound Vibrations. A very thin rubber band isslipped over the tracing pointand drawn down through asmall hole in the baseboard, asshown in Fig. 135, until thenecessary tension is secured for keeping the point in delicatebut continuous contact with the smoked plate. The best plates for…
Physics · Lantern projection · Electric apparatus and appliances
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