Tyndall, John, 1820-1893 · New York : Appleton · leaf 101
ou is the siren as greatlyFlo-8a improved by Dove. The pasteboard siren, whoseperf ormance you have al-ready heard, was devisedby Seebeck, who gavethe instrument variousinteresting forms, andexecuted with it manyimportant experiments.Let us now make thesiren sing. By pressingthe key m, the outer… … EXPERIMENTS ON PITCH. 95 slowly that they may be counted. But as the motion aug-ments, the puffs succeed each other with increasing rapid-ity, and at length you hear a deep musical note. As thevelocity of rotation increases the note rises in pitch ; it isnow very clear and full, and as the air is…
Sound
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