. 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. 956. PERPETUAL MOTION. Mercurial displacement in acistern of water. A cistern fuU of water 4 feet deep. Let B be a wheel; freely suspended within it, letthere be four glass tubes 40 inches long,c, c, c, c, having large bulbs, holding, say,a pint, blown at the closed e
. 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. 956. PERPETUAL MOTION. Mercurial displacement in acistern of water. A cistern fuU of water 4 feet deep. Let B be a wheel; freely suspended within it, letthere be four glass tubes 40 inches long,c, c, c, c, having large bulbs, holding, say,a pint, blown at the closed end. Fillthese tubes with mercury, fix on an In-dia-rubber bladder, that will hold apint, to each of them at the open end,and let them be attached round thew^heel, as in the figure. As the pres-sure of 40 inches of mercury will exceedthe atmospheric pressure, and also that of the four-feet column of water,when the India-rubber bottle is lowest, and the tube erect, as at D, themercury will fill it, leaving a vacuum in the glass bulb above. On theopposite side the mercury will fill the glass bulb, and the India-rubberbottle will be pressed flat, as will also be the case in the two horizontaltubes. Now, it is evident that the two horizontal tubes exactly balance. 3^4 PP:KrETUAL MOTION. each other; but the tube, D, with its bulb swelled out, displaces a pintof water more than its opposite tube, and hence will attempt to rise withthe force of about one pound, and each tube, when it arrives at thesame position, must produce the same result; the wheel must have acontinual power, equal to about one pound, wdth a radius of two feet.
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