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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
ht angles to thefirst ellipse, and so on ; alternately ap-proaching and receding from the posi-tion of equilibrium, each vibration dimin-ishing in amplitude, until all parts of the bell come again to a state ofrest. It is the springing of the bell forward and backward, in this manner,that… … 563. Figure 12.—Harmonicon.—This is a musical instru-ment, consisting of a number of glass goblets of different sizes, fastened Fig. 13. ® © ® ®® © 0® Physics · Astronomy
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