. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 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 electri
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 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. Fig. 8.—Electric-motor pump. through copper wires or rods, thus dispensing with the cumbrous reciprocating pump-rodsused in the Cornish system of mine pumps, or with the steam pipes used with direct-actingsteam-pumps. Fig. 8 illustrates an electric motor applied to a duplex water-works puraping-engine. The motor is of the Edison vertical type, arranged with insulated pinion, etc. Thewater end of the machine is the usual water, works type, having composition plungers work- PUMPS, EOTARY. 689 ing through composition sleeves. The suction valves being placed below and the dischargevalves above the plungers, gives the room necessary for a very large amount of valve areaand water ^aassages. This reduces the friction of the water as it passes through the pumpto a minimum. There is a connection between the discharge of the pump (immediatelv underthe air chamber) and the suction-chamber with a gate valve on same ; the object of thisarrangement is that when starting up the pumping-engine the
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