. Chamber's scientific reader : illustrated with wood engravings. Readers. Fig. 8. rig. a times take a section of this machine (fig. 9), we see at once how it acts like a lever. Although the machine might be turned round, yet, in every position, the weights act at right angles to the diameters of the wheel and of the axle ; and as the machine is perfectly rigid, it is easily seen that it is simply a lever, with F, the centre of the axle, for its fulcrum, and having on one side half the diameter of the wheel, and on the other half the diameter of the axle. If the half-diameter, FA, were six hal
. Chamber's scientific reader : illustrated with wood engravings. Readers. Fig. 8. rig. a times take a section of this machine (fig. 9), we see at once how it acts like a lever. Although the machine might be turned round, yet, in every position, the weights act at right angles to the diameters of the wheel and of the axle ; and as the machine is perfectly rigid, it is easily seen that it is simply a lever, with F, the centre of the axle, for its fulcrum, and having on one side half the diameter of the wheel, and on the other half the diameter of the axle. If the half-diameter, FA, were six half-diameter FB, the weight, P, would balance a weight six times greater than itself. What has been said applies to the machine in a state of equilibrium; for practical pur- poses, however, the weight on the wheel is not used, the axle being turned by a winch, H (fig. 8). The strength of a man pressing round the handle, acts like the weight on the circumference of the wheel. The capstan, used on board ships for heaving the anchor, is on the same principle (fig. 10). The fulcrum is the centre of the machine ; the short end of the lever with the heavier weight, is half the diameter of the part round which the. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London : W. & R. Chambers
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1872
