Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 193
sturbance of the air sets the flame in activevibration. A SIREN FOR MEASURING VELOCITIES. In this instrument advantage is taken of the well knownfact that for every tone a resonator may be provided thatwill respond to and re-enforce the vibrations producing thattone. The length of a closed resonant… … Details of the Siren. may be adjusted to respond to different pitches. Knowingthe number of vibrations required per second to produce acertain pitch, it is comparatively an easy matter to deter-mine the rate of any series of regular air vibrations byadjusting the tube to such a length as to cause…
Physics · Lantern projection · Electric apparatus and appliances
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