Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
acts as a sounding-board, and so attunedto each other as to form the harmonical scale. The glasses are madeto vibrate by touching the edges with the wet finger, and their tonesmay be prolonged, and made to swell or diminish, like those of theviolin. This simple contrivance, first invented by… … -If two series ofsonorous undulations encounter each other in opposite phases of vibra-tion, the phenomena of interference will be. pro-duced. If both arms of the tuning-fork are vibrating,they will recede from and approach each other, asindicated by the dotted lines. If the instrument beplaced…
Physics · Astronomy
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