Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 608
ape of the bell, Its pitch maybe altered by the use of auxiliary tubes,called crooks, by which the acousticlength of the instrument may be in-creased or diminished. The missingnotes of its scale were formerly inter-polated by partially stopping the bellwith the hand, but the modern orches-tral… … Fig. 405.
Physics
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