. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fio. J.—Elevator engine. FiQ. 1.—Steam freight elevator. The valve operates in the following manner:of the lower piston; therefore, when the smallpilot-valve is raised by the lever(thusopening communication be-tween the upper jiart of the largevalve-cylinder and the discharge-tank) tiie main valve will moveup: but the moment the valvebegins to move, it commences toclose the pilot-valve port, thuscutting off the disc

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. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fio. J.—Elevator engine. FiQ. 1.—Steam freight elevator. The valve operates in the following manner:of the lower piston; therefore, when the smallpilot-valve is raised by the lever(thusopening communication be-tween the upper jiart of the largevalve-cylinder and the discharge-tank) tiie main valve will moveup: but the moment the valvebegins to move, it commences toclose the pilot-valve port, thuscutting off the discharge at apoint proportionate to the move-ment of the lever in the car. Bylowering the jiilot-valve, water isadmitted to the upper part ofthe large cylinder, and the valvedescends in the same manner asabove. The port or apron stopconsists of aprons on top andbottom of piston, with holesdrilled in them in a progressionsuch that when the apron ad-vances over the upjier or thelower port the area for the owt-llow of water is gradually di-minished, in a ratio such that therctiirdalion of the jiiston is uni-form throughout the length ofstop, therefore bringing the carto a gra