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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) Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 316
563. Figure 12.—Harmonicon.—This is a musical instru-ment, consisting of a number of glass goblets of different sizes, fastened Fig. 13. ® © ® ®® © 0® … to the bottom of a box which 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… Physics · Astronomy
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