Stewart, Balfour, 1828-1887 · Toronto : James Campbell · leaf 70
of sound also explains what takes place inwhispering galleries. In that of St. Pauls in London,for instance, a whisper at one side of the dome isconveyed to the opposite side across a very consider-able distance. 47. How to find the number of vibrationsin one second corresponding to any note.—I… … Fig. 23. is called the pitch or tone of the note depends there-fore upon the number of blows whicli is given to theair in one second. Now we can find out by experimenthow many blows in one second correspond to anyparticular note, and I hope by means of the abovefigure to make it clear to you how…
Physics
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