. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 638. THE DEAD CENTER PROB-LEM. The crank pin is held off the cen-ter by the spring J, the tension of whichalways pushes the crank pin off the the action of a single treadle iny the two extreme positions. 639. THE DEAD CENTER PROBLEM. A supplementary crank
. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 638. THE DEAD CENTER PROB-LEM. The crank pin is held off the cen-ter by the spring J, the tension of whichalways pushes the crank pin off the the action of a single treadle iny the two extreme positions. 639. THE DEAD CENTER PROBLEM. A supplementary crank set at an angle with thepedal crank and a spring J, to bring the pedalcrank to the proper position for starting. The dotted lines show the opposite positionof a center hung treadle. MOTION AND CONTROLLING DEVICES, ETC. 247. 640. CRANK SUBSTITUTE. The shaft to bedriven has recesses in which are pawls or frictiondevices, two rings being placed on the sleeve hav-ing internal ratchets when pawls are used, whilebands are connected to the rings and to a frame sothat when the frame is moved downward one of therings on the sleeve will move the balance wheel, whileas the frame moves upward the other ring drives thebalance wheel, the opposite pawls or friction deviceslipping over their respective rings alternately withthe contrary movements.
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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910
