Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 401
gives the tones c, e, g, and cl\ and the uppergives d, g, J, and c. Hence we cannot get the characteristic effect of beats byusing any of these tones in their ordinary way, that is, withthe chests stationary and the discs rotating. For, when thedisc was spinning fast enough to produce audible… … Fig. 86.—Helmholtz Siren. revolves, is itself capable of a slow rotation by means of ahandle and pair of wheels seen in the figure at the righthand top corner. If we use the circles of 12 holes in eachchest, and do not turn the handle, we obtain tones of the 297 COMBINATIONAL TONES 383 same pitch…
Sound
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