The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . e poise-frame and k by the weight-frame, while h is being transferred from one to the weights in the poise-frame on the left have a value ofone hundred pounds, those on the next frame one thousandpounds, and on the last ten thousand, and the results THE EMERY TESTING-MACHINE. 385 are read on the scale and by the figures sliown in the slotadjoining. The indicator-needle F constitutes the final lever of thescale, having a movement at the point of about two inches,and this movem
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . e poise-frame and k by the weight-frame, while h is being transferred from one to the weights in the poise-frame on the left have a value ofone hundred pounds, those on the next frame one thousandpounds, and on the last ten thousand, and the results THE EMERY TESTING-MACHINE. 385 are read on the scale and by the figures sliown in the slotadjoining. The indicator-needle F constitutes the final lever of thescale, having a movement at the point of about two inches,and this movement is calculated to be three hundred thousandtimes greater than the movement of the piston c in thefirst hydraulic chamber, and in the largest sizes has beenmade to indicate six million times as much. That themachine does not suffer by repeated strains is shown by thefact that this needle returns to exact zero after every trial,whether strained in one direction by the compression of apiece, or in the other by rending a specimen in two. Themachine, as now manufactured, is different in appearance Fig. TUE EJIEKY TESTING-MACHINp;—• .-?1/K. from the diagram just discussed. While the weighingmechanism is the same, it will be seen that the firsthydraulic cylinder is laid on its side, so as to constitute rather than a vertical machine. This change 386 WONDERS OF MODERN MECHANISM. affords certain advantages in overcoming the enormousshocks of recoil. In all but the smallest size of machinethe weighing-head, shown on the left of illustration, and thestraining-head, shown on the right, are made so as to reston wrought-iron girders, or frames, along which they canslide without injury to anything. The machine here shownis of the two-hundred-thousand-pound class, and back ofit, to the right of the weighing mechanism, is shown apump for delivering the water-supply to the straining-head,which exerts the required force through the massive
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectmechanicalengi
