Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Hyflmulic Wheel. it may he pan of sand upon whose surface the oil isignited. See G.\s-iie.\ter ; Gas-stove. Pig. causes a flow of electricity from the positive to thenefjative metal. .Sec Hydro-e-lectric Ma-chine. {Eicctrkit;/.)A machine invcnited in 184(1 liy Mr. (now Sir Wil-liam) Aimstrong, in whicdi electricity is generatedby th
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Hyflmulic Wheel. it may he pan of sand upon whose surface the oil isignited. See G.\s-iie.\ter ; Gas-stove. Pig. causes a flow of electricity from the positive to thenefjative metal. .Sec Hydro-e-lectric Ma-chine. {Eicctrkit;/.)A machine invcnited in 184(1 liy Mr. (now Sir Wil-liam) Aimstrong, in whicdi electricity is generatedby the friction of steam against tlie sides of orificestlirongh which it is allowed to |ie under highpressure. A steam-boiler is su]iportc(l on four glasslegs. The steam is conducted over wet cotton wicksbefore escaping, in order to take up water whosefriction against the sides of the orifice is the gen-erator of the electricity, the steam being the drivingpower. The positive electricity is collected liydirecting the jet of steam upon a metallic combcommunicating with an insulated conductor. Hydro-ex-tractor. A form of filter ordryer in whicli a ]ii|uid is driven by centrifugalforce from or thiough a mass deposited in achamber rotating at high velocity. See Hyrlroenrbon Boiler-Fiirnare, Hydro-carbon - furnace. One spe
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