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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 74

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 74
MECHANICAL POWERS. <J7 W P : A\ = 1 : -Z—or, in numbers, 0 : 12 = 1 : 2; or P = —, and W = P X 2—or, in numbers, 6 = --, and 12 = G X 2.The power moves twice as fast as the weight. 77. Figure 35.—Movable and immovable pulley.—This is a combination of the two pulleys previously descril)ed; atid,…

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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