Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 128
. And if, whilearranged thus, a fork and string vibrate with sufficientrapidity to produce musical notes, the note of the forkwill be an octave above that of the string. But if, instead of the hand being moved to and fro inthe direction of this heavy cord, it is moved at right anglesto that… … and string, in this case, synchronise perfectly; and if thehand could emit a musical note, the cord would emit anote of the same pitch. The same holds good when avibrating fork is substituted for the vibrating hand. Hence, if the string vibrate as a whole when the vibra-tions of the fork are along…
Sound
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