. 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. 371. PNEUMATIC LIFT. Ridgwaytype, oil governed. A tube extends from areservoir down the inside of the hollow pistonrod. The reservoir is filled with oil. Whenthe hook is lowered, the oil is drawn into thepiston rod through the check valve. Thechain wheel and needle va
. 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. 371. PNEUMATIC LIFT. Ridgwaytype, oil governed. A tube extends from areservoir down the inside of the hollow pistonrod. The reservoir is filled with oil. Whenthe hook is lowered, the oil is drawn into thepiston rod through the check valve. Thechain wheel and needle valve govern the flowof oil, which by its non-compressibility pre-vents vibration of the load and holds it atany desired height. This device eliminatesthe jerky motion of the plain air lift. Type of the Craig Ridgway & Son Com-pany, Coatesville, Pa. 372. AIR-OPER-ATED HYDRAU-LIC CRANE. Com-pressed air pressure ina supplementary cyl-inder forces the waterinto the lifting cylin-der. A water valvegoverns the flow ofwater and holds theweight steady orlocked by closing thevalve. 152 AIR-POWER MOTORS AND 373. VALVE-LIGHT VENTI-LATOR. The valves are of glass set inframes and hung to swing, controlled byconnecting rods to a vertical pole extend-ing down within reach of the hand. 374. FRUIT-DRYING APPARATUS. A box, a, arranged for receiving perforatedshelves or netting on frames. A fresh-airinlet, g, and heating chamber, c, under whicha lamp is placed. A deflecting plate, h, tospread the warm air evenly through the another at the top for gathering the airto the ventilator ^y m, a thermometer. Tem-perature should be 100° Fah. SECTION IX. GAS AND AIR-GAS DEVICES, ETC •S3 Section AND AIR-GAS DEVICES, ETC. 375. KEROSENE PORTABLE FORGE. French. The ap-paratus consists of a copper reservoir, P, containing the petroleum, and traversed by a pump, C, whichserves to establish a pressure of air atthe surface of the liquid. Above thereservoir, and separated therefrom by
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