[Electric engineering.] . dynamo shaft running on pulley lower case is filled with oil to a point a little below therheostat-arm shaft. Fig. 15 shows the working parts of the regulator with theouter casing removed. The pump consists of two gears1, 2, Fig. 15, meshing with each other. Oil is drawn fromthe lower part of the box and discharged through the valve,which moves up and down in a chamber at e. The seriesmagnet m pulls on the lever <?, which operates against § 19 ELECTRIC LIGHTING. 23 the adjusting spring/. The valve is operated by means ofthe link r. The piston or vane b is mov
[Electric engineering.] . dynamo shaft running on pulley lower case is filled with oil to a point a little below therheostat-arm shaft. Fig. 15 shows the working parts of the regulator with theouter casing removed. The pump consists of two gears1, 2, Fig. 15, meshing with each other. Oil is drawn fromthe lower part of the box and discharged through the valve,which moves up and down in a chamber at e. The seriesmagnet m pulls on the lever <?, which operates against § 19 ELECTRIC LIGHTING. 23 the adjusting spring/. The valve is operated by means ofthe link r. The piston or vane b is movable and is free toswing around in the chamber t. The partition w is fixed, sothat when oil is pumped in above w and is allowed to flowout below, the vane b moves clockwise and moves the rheo-stat arm in the same direction. When oil is pumped in onthe lower side and allowed to flow out on the upper, thevane moves counter clockwise. When the current is at itsnormal value, the valve is in its central position and the ports. Fia. 16. are arranged so that the oil passes in and out of the valvechamber without affecting the piston. Under such circum-stances, therefore, the rheostat arm remains stationary. Fig. 16 shows the arrangement of the valve. It is hereshown in its mid-position and the arrows show how the oilflows past the valve and back into the chamber. When thevalve is raised slightly, the flow through the ports <?, o isstopped and oil is forced into the chamber ,r, thus for-cing the piston to the right, or clockwise. As soon as 24 ELECTRIC LIGHTING. § 19 the current has regained the normal amount, the valveagain assumes the central position and the oil flows throughit as before. If the current falls below normal, the magnetbecomes weakened and the valve moves below the centralposition. In this case the upper chamber x is cut off fromthe pump, but is opened to the outside while the cor-responding lower chamber is opened to the pump and cutoff from the outside and the va
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