A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 775
750 SOUND CHAP. means of a diagram similar to Fig. 633, known as Cheshires disc.A small circle ABC (Fig. 694) is equally divided into 12 parts bypoints on the circumference. Perpendiculars are dropped fromthese points upon the diameter AC and the feet of these perpen-diculars are taken successively… … FIG. 694.—Cheshires disc. until A is reached again. On covering up all but a strip EF, whichrepresents the pipe, and rotating the circles about the centre of thecircle ABC, the lines will vibrate longitudinally, N, N, N being nodesand A, A antinodes. It will be seen that the lines move from…
Physics
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