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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 374

An illustration from 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, leaf 374
ELECTRICITY. 367 Fro. 19. … Fig. 21. 687. Figure 19.—The electrical -wheel consists of four ormore pointed arms, bent at right angles at the ends, and connected atthe centre to a small cap, which is free torotate on a pivot in a horizontal plane. The wheel is sustained by a metallicsupport, set upon an arm of the prime…

Physics · Astronomy

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More pictures from 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

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