Elements of natural philosophy (Volume 2-3) . Flute made § 107. The mode here supposed of exciting and sus-taining the vibrations of a column of air in an open tubemay easily be put in practice. Take a common tuning-fork and by meansof sealing wax fas-ten a circular discof card on one of itsbranches, sufficient-ly large to nearly co-ver the open end ofa pipe. The upperjoint of a flute withthe mouth hole stop-ped will answer wellfor the purpose; it may be tuned in unison, that is,made of proper length by the sliding stopper. Thefork being set in vibration by a blow on the unloadedbran
Elements of natural philosophy (Volume 2-3) . Flute made § 107. The mode here supposed of exciting and sus-taining the vibrations of a column of air in an open tubemay easily be put in practice. Take a common tuning-fork and by meansof sealing wax fas-ten a circular discof card on one of itsbranches, sufficient-ly large to nearly co-ver the open end ofa pipe. The upperjoint of a flute withthe mouth hole stop-ped will answer wellfor the purpose; it may be tuned in unison, that is,made of proper length by the sliding stopper. Thefork being set in vibration by a blow on the unloadedbranch, and held so as to bring the disc just over themouth of the pipe, a note of great clearness and strengthwill be heard. Indeed, a flute may be made to speakperfectly well by holding a vibrating tuning-fork closeto the embouchure, while the fingering proper to thenote of the fork is at the same time performed. § 108. But the most usual method of exciting the vibra-tions of a column of air in a pipe is by blowing acrossthe open end, or across an opening made i
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