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50 STEADINESS OF MUSICAL SOUNDS. [I. § 23
precisely equal times. This conception of the physical conditions under which musical sounds are produced will suffice for the present. We proceed to consider in detail the various ways in which such sounds may differ from each other, and to investigate the mechanical cause to which each such difference is to be referred. In what follows, by the word * sound' will always be meant 'musical sound,' unless the contrary be expressly stated.