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)
S. 59 Forces {or ichat is the some, forces and resistances) in equilibriummust he to each other inversely as their velocities, and inversely as thespaces which they describe. Levers. Figure 24.—Lever of the first class.—A lever, in nse, im-plies au inflexible bar. fulcrum, power, and resistance.… … The relative length of these arms is shown by figures, and also by a cor-responding number of equal spaces, marked on the lever; and therelation between the power and weight is indicated by figures—theball being the power. The conditions of equilibrium with all levers are these: the weightand power…
Physics · Astronomy
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