Perkins, Henry, 1803-1889, publisher, Haswell, Barrington, and Haswell, printer, McManus-Young Collection (Library of Congress) DLC · Philadelphia : H. Perkins, 134 Chestnut Street · leaf 63
and strew their upper sur-faces with sand. Cause one of the discs,viz. the upper one, to vibrate by a bow,and its vibration will be exactly imitatedby the lower disc, and the sand strewedover both will arrange itself in preciselythe same forms on both discs. But if,separately, they do not agree in… … SIGHT AND SOUND. 43 edges, and will emit only a disagreeable and puffy sound. Norwill the glass ring while the wine is brisk, and filled with air-bubbles ; but, as the effervescence subsides, the sound will be-come clearer and clearer, and when the air bubbles have entirelydisappeared, the glass…
Scientific recreations
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