. Railroad digest . ce but which will act over a greater results can be obtained with the form of magnet knownas the solenoid, which consists of one or two wire coils andan iron plunger which is drawn into the core by the magneticattraction. A single coil solenoid is illustrated in Fig. 3,and a double coil or horseshoe solenoid, in Fig. 4. If thecoil of a solenoid is encased in an iron tube its force will beincreased. In the foregoing article the why and wherefore of the wholesubject are gone into very thoroughly, and two tables are givenfor aid in making calculations. Direct-Act
. Railroad digest . ce but which will act over a greater results can be obtained with the form of magnet knownas the solenoid, which consists of one or two wire coils andan iron plunger which is drawn into the core by the magneticattraction. A single coil solenoid is illustrated in Fig. 3,and a double coil or horseshoe solenoid, in Fig. 4. If thecoil of a solenoid is encased in an iron tube its force will beincreased. In the foregoing article the why and wherefore of the wholesubject are gone into very thoroughly, and two tables are givenfor aid in making calculations. Direct-Acting Electric Pump steam Engineering, May, 1901, p. accompanying cut illustrates the principle of a direct-acting electric pump recently patented. Reciprocating actionof the pump plunger is obtained by the reaction of a solenoidmagnet A on the stationary core B, which is also magnetized bythe coil C. The solenoid is tied to the pump plunger by the rodsshown, connecting by a yoke. The yoke carries an arm which. Blactrlo Pump. operates the reversing mechanism by striking tappets at theends of the stroke. By this action the the electriccurrent is reversed, which causes a reversal of the movementof the solenoid. The box D contains the electric contact mechan-ism and is filled with glycerine to prevent destructive spark-ing when the contacts are broken. Of course the pump enddoes not necessarily differ in any manner from that of an ordi-nary pump. Telegraph Wires Laid on Snow Consular Reports. May 21, 1901, p. Guenther, of Frankfort, says that, accordingto experiments conducted by Mr. H. Janssen on Mont Blanc, itIs not necessary to erect poles for stringing telephone and tele-graph wires in snow-covered countries. If the snow is several Vol. XI. No. 6 RAILROAD DIGEST 235 inches thick, it serves as a good insulation ; the wires can simplybe laid down and be ready for transmission of messages. TheCousul-Geiieral adds that similar experiments with e
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