A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 137
HflBM … Fig. 22. Stoppers are provided for the resonators and connected bymeans of strings with a keyboard in front, in such a way thaton depressing any key the corresponding fork is heard vibratingloudly. When the keys are all down and the stoppers closed,all that is heard is a gentle humming sound.…
Physics
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