. The Family tutor . Fig. 165. the counteractingthe arms of the Fig. vertically meter of the wheel, to that of the axle. In Fig. 166, we see that the weight, W, corresponds to force, P, in an inverse ratio to lever ; that is, inversely to the radii, a b, and d c, of the wheel. Let us suppose that the radius, a b, of the axle, is four times lass than the radius, d c, of the wheel, we may equipoise a weight of eighty pounds by a force of twenty pounds.—W. T. K.] Sometimes the wheel is replaced by a winch, as inFig. 167; it is then called a windlass, if themotion is vertical; but if it
. The Family tutor . Fig. 165. the counteractingthe arms of the Fig. vertically meter of the wheel, to that of the axle. In Fig. 166, we see that the weight, W, corresponds to force, P, in an inverse ratio to lever ; that is, inversely to the radii, a b, and d c, of the wheel. Let us suppose that the radius, a b, of the axle, is four times lass than the radius, d c, of the wheel, we may equipoise a weight of eighty pounds by a force of twenty pounds.—W. T. K.] Sometimes the wheel is replaced by a winch, as inFig. 167; it is then called a windlass, if themotion is vertical; but if it be horizontal, as inFig. 168, the machine is called a capstan, whichdiffers from the windlass in having its revolving axisThe circumference is pierced with holes which receive long levers,
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Keywords: ., bookcentury1800, bookdecade1850, bookpublisherlondo, bookyear1851
