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)
ormation. Figure 24. — If a squareplate of glass be grasped in thecentre by the hand-vice, andsand scattered over its surface,and the violin-bow drawn rap-idly across it, close to one of itsangles, the sand will be throwninto the position shown by thedots. Powdered litmus, previously mixed with… … 318 ACOUSTICS. Figure 25.—If the plate be confined near one of its angles, andthe bow applied to the middle of one of its sides, the sand Avill bearranged as shown by the dots in the figure. Fig. 25.
Physics · Astronomy
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