Electric railway journal (1909) (14761147862)

Identifier: electricrailway341909newy (find matches)
Title: Electric railway journal
Year: 1908 (1900s)
Authors:
Subjects: Electric railroads
Publisher: (New York) McGraw Hill Pub. Co
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries



Text Appearing Before Image:
down through the small fuse, fromwhich it passes momentarily through both magnet coils ofthe switch-throwing machine to the ground. The currentflowing through the relay coil causes the armature to liftand break the contacts shown to the right in the wiringdiagram. This cuts out the right-hand switch-throwing solenoid, but leaves the left hand solenoid energized,thus causing the plunger to move to tin- left and throw theswitch to the left. The small amount of current flowing 292 ELECTRIC RAILWAY JOURNAL. (Vol. XXXIV. No. 8. in the relay magnet coil is sufficient to break the right-handcontacts, but is not sufficient to lift the long latch shownto the left. If current is on when the trolley wheel passes under thecontactor, the same preliminary circuit is set up, but asall the current going through the car must also passthrough the relay, both the long and the short latches arelifted. This breaks the bottom contact on the long latchand establishes a top contact which energizes the right-
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Relay and Fuses in Box on Pole hand solenoid and cuts out the left-hand coil. Theplunger then moves to the right and throws the switchpoint to the right. By adjusting the contacts which sup-port the long latch either up or down the relay can be ad-justed to care for any amount of current consumed by theheaters, lights or air compressors on the cars when run-ning under the contactor with the motors cut off. No ex-ternal resistances are used, and a car standing with thetrolley wheel in contact with the contactor cannot injure any parts of the apparatus. HEAVY ELECTRIC LOCOMOTIVES FOR SWITZERLAND The Berner Alpenbahn Gesellschaft has placed an orderwith two German firms and the Oerlikon Company forthree large motor cars and two large locomotives, to beemployed on the new Spiez-Frutigen 15,000-volt single-phase line. A water-power plant near Spiez will furnishthe current at 15 cycles. Catenary overhead constructionand bow collectors are to be used. The motor cars will beequipped with four