Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 553
the sides of the holes, setting the discin rotation. As a result of this rotation, the air escapesin a succession of puffs which give rise to musical soundsof definite pitch. In order to count the number of revolu-tions, the spindle 0 carries at the upper portion a screwwhich can be made to engage… … t Fig. 358. VIBR OS COPE. 543 is a similar wheel, K the whole serving as an automaticcounter of the number of revolutions made by the perforateddisc. In order to study notes which are simply related, thesiren is usually made with more than one row of holes inthe disc, and provided with stops, so…
Physics
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