Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 177
be entertaining had to be heard. Theseinstruments had each but one mouthpiece and one diaphragm,which answered the double purpose of receiving the soundand of giving it out again. Strangely enough, the recentlyimproved phonograph is more like the original one than anyof the others. It is provided… … B SOUND. 155 struction, it is something like a ver)^ small engine lathe ; themain spindle is threaded between its bearings, and is pro-longed at one end to receive the hardened wax cylinderupon which the sound record is made. Behind the spindleand the cylinder is a rod upon which is arranged a…
Physics · Lantern projection · Electric apparatus and appliances
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