. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . of wheel 8/•5b per cent;total coal fired to furnace, 14,750 lbs.; total water fed to boilers, 109 890 lbs.; tempemtineof feed water, 120-62° F.; water evaporated per lb. coal, 7-45 lbs.: duty, water raised pei100 lbs. coal used, 75,944,424 ft. lbs.; duty, water raised per 1,000 lbs. steam used, 101,- 936,504 ft. lbs. ^ . • , u u t? t> wm. ir Cn Geared Mine Pump.—Fig. 7 shows tvpe of pumpmg-engine built by E. F. A
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . of wheel 8/•5b per cent;total coal fired to furnace, 14,750 lbs.; total water fed to boilers, 109 890 lbs.; tempemtineof feed water, 120-62° F.; water evaporated per lb. coal, 7-45 lbs.: duty, water raised pei100 lbs. coal used, 75,944,424 ft. lbs.; duty, water raised per 1,000 lbs. steam used, 101,- 936,504 ft. lbs. ^ . • , u u t? t> wm. ir Cn Geared Mine Pump.—Fig. 7 shows tvpe of pumpmg-engine built by E. F. Allis & Co.,and used for pumping out mines. The top of the - bob is shown projecting through the 688 PUMPS, RECIPROCATING. floor; this is made to fit any location or conditions. The rods connecting the bob withthe [)iimps and crank are made any size or length, depending on the depth of the shaft and itsdistance from the engine : these i-ods are supported by trucks and rollers or carrier arms asdesired. The common design of single-acting Cornish pumps is usually adopted for thisservice. The pumps are driven by a Reynolds Corliss engine, by means of a shrouded step. Pig. 7.—The Allis geared mine pamp. tooth pinion and gear of such proportions that the engine will run at a fair rate of speedwhile the pump plungers move at a slow speed when running at rated capacity. Electric Pumps.—The numerous a{)|)lications of electricity to pumping purposes whichhave been made during the last five years simply amount in most cases to the attachment toany form of jjumping machine of an electric motor. Quite recently such applications havebeen made to heavy pumping, as for water-works, deep mines, etc. In the latter the power istransmitted from the electric generator on the surface to the motor at the bottom of the mine
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
