Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 172
tube, sothat the disk is illuminated only by the light of the inter-mittent flame. When the disk attains a proper speed, the SOUND. 149 intermittent illumination will cause it to appear stationary.This beautiful experiment is due to Toepler. By employing a concave mirror instead of a plane oneas… … A Simple Phonograph. a mouthpiece, A, to which is attached a thin ferrotypeplate diaphragm, B, by means of a good quality of seahngwax or cement. Upon the outer face of the diaphragm, and at oppositeedges, there are guides, C D, for receiving the wooden strip,F. These guides present only a slight…
Physics · Lantern projection · Electric apparatus and appliances
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-433-284.webp)
