. Electric railways, theoretically and practically treated . Fig. 151.—AUTOMATIC AIR BRAKE SYSTEM.(Installed on Interborough R. R., ) The pump governor is a device inserted in the motorcircuit for the purpose of automatically maintaining the BRAKES AND BRAKING. 247 main reservoir above a predetermined point. In the pumpgovernor the motor switches are controlled by a relay ac-tuated by a contact mounted on the arm of an ordinaryBourdon pressure gauge or by contacts mounted on thepiston of a swell air cylinder acting against an adjustablespring. In the case of train service it is usual to ha
. Electric railways, theoretically and practically treated . Fig. 151.—AUTOMATIC AIR BRAKE SYSTEM.(Installed on Interborough R. R., ) The pump governor is a device inserted in the motorcircuit for the purpose of automatically maintaining the BRAKES AND BRAKING. 247 main reservoir above a predetermined point. In the pumpgovernor the motor switches are controlled by a relay ac-tuated by a contact mounted on the arm of an ordinaryBourdon pressure gauge or by contacts mounted on thepiston of a swell air cylinder acting against an adjustablespring. In the case of train service it is usual to have thepump governors of the several cars of a train intercon-nected, so that all pumps on the train may cut in and cutout at the same time ; the necessity for this is evidentsince without such a device the pump having the lowest set ^^SSi^^^. Fig. 152.—G. E. MOTOR DRIVEN AIR COMPRESSOR. governor would pump air for the train, and deterioraterapidly on account of being constantly overloaded. In addition to the above these two other methodsin general are for supplying compressed air to the brakeapparatus of electric cars. Under certain conditions itis found expedient to compress the air at stationary aircompressor stations to a high pressure, and charge large 248 ELECTRIC RAILWAYS.
Size: 1985px × 1259px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkvannostrand
