. Railway and Locomotive Engineering . g wheels trackingwith the forward wheels. On each sideof the cab. within easy reach of the ope-rator, there is a brake valvL, that controlsthe operation of the air brake the automatic type, air being suppliedtl the main reservoir by a motor driven;.ir compressor. The application of airacutates a system of equalizing levers,operating the internal expanding brakescarried by the wheels. Air brake hoseccniplings allow the use of air on the carst. be shifted. Tile normal drawbar pull of the tractoris 8.(100 lbs. On a trial test, a locomotive(if tl
. Railway and Locomotive Engineering . g wheels trackingwith the forward wheels. On each sideof the cab. within easy reach of the ope-rator, there is a brake valvL, that controlsthe operation of the air brake the automatic type, air being suppliedtl the main reservoir by a motor driven;.ir compressor. The application of airacutates a system of equalizing levers,operating the internal expanding brakescarried by the wheels. Air brake hoseccniplings allow the use of air on the carst. be shifted. Tile normal drawbar pull of the tractoris 8.(100 lbs. On a trial test, a locomotive(if tlie Class R type rated at 21,500 draw-bar pull, with throttle wide open, waspulled backwards several feet by thetractor. Following are some of the prin-cipal dimensions and characteristics: Length over couplers, 23 ft.; wheelbase, \2y2 feet; diameter of wheels overtires. 5 ft.; tread of wheels. 7 ft.; widthof tires. 12 ins.; width over all, 8 ft. 4ins.; height over all, 11 ft. 3 ins.; weight, lbs.; speed (normal) 6 miles in city streets for delivery to local indus-tries. Some of the most remarkable featuresof this tractor are that it drives, steers,and brakes, on all four wheels. The de-velopment of these features was madenecessary on account of the short radius The transformer used so commonly atthe present day in connection with elec-trical energy js very simple in construc-tion. One can hardly pass along thestreets without noticing them either onthe poles of the lighting company or on the houses usmg electric power for lights. The principle of the transformer wasdiscovered Ly Faraday. Among some ofhis earliest experiments he took an ironring about 8 inches in diameter andwound upon it two insulated coils ofwire, on opposite quarters, each of manyturns. He found if one coil was con-nected to a battery circuit, that when thecurrent was on or off a currentwas generated in th? other coil, althoughthe two were in no way connected to
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