. 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. Side view of cranks and treadle 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.

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. 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. Side view of cranks and treadle 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

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Keywords: ., bookauthorhiscoxgardnerdexter18, bookcentury1900, bookdecade1910