Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 140
, the successive taps of theFig. 119. teeth of the disk up- on the paper pro-duce a shrill musicalsound, which variesin pitch according tothe speed of the disk.Such a disk mountedon a shaft and re-volved rapidly isknown as Savartswheel. It is ascertainedby these cxperi-f .. ■ ...7 ments that… … ii8 EXPERIMENTAL SCIENCE. slow rate, produce only noises. It has been determinedthat the lowest note appreciable by the ear is produced bysixteen complete vibrations per second, and the highest by24,000 complete vibrations per second. VIBRATING RODS. The zylophone and metallophone are examples ot…
Physics · Lantern projection · Electric apparatus and appliances
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