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)
be raised^without moving the elbow^it is evident that the musclemust exert a force as much greater than the weight of the forearm andball, as the distance from the elbow to the hand is greater than thatfrom the elbow to the point of attachment of the muscle; and there-fore the rapidity and extent… … The Wheel and Axle. 71. Figure 29.—The wheel and axle.—This machine is amodification of the lever of the first class, and, being constant in itsaction, it is sometimes called the perpetual lever. It consists of acylinder, termed the axle, connected with a wlieel of much greaterdiameter. The power…
Physics · Astronomy
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