. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . ue to the transmissionof the resultant drag of the track shoes to the brake shoes bymeans of suitable levers. (4) A back torque in the motors which act as generators,supplying current to the magnets. These effects combine to produce a braking effort which is notonly a powerful one, but which has certain peculiar character-istics not common to hand or air brakes. The magnetic track brake consists of three essential parts:(1) An electro-magnet equipped with steel track shoes which 340 ELECTRI
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . ue to the transmissionof the resultant drag of the track shoes to the brake shoes bymeans of suitable levers. (4) A back torque in the motors which act as generators,supplying current to the magnets. These effects combine to produce a braking effort which is notonly a powerful one, but which has certain peculiar character-istics not common to hand or air brakes. The magnetic track brake consists of three essential parts:(1) An electro-magnet equipped with steel track shoes which 340 ELECTRIC RAILWAY TEST COMMISSION form the poles; (2) a system of levers for transmitting the brak-ing force to the wheel brake shoes; and (3) an electrical regu-lative device for controlling the electromotive force, which canbe furnished by the car motors acting as generators. The construction of the brake and rigging is shown in , 95, and 96. Fig. 94 shows a view of the braking equipmenttaken from imder the car, at a point midway between thetrucks. Fig. 95 represents a transparent view, showing the. Fig. 94. — General View of Braking Equipment Taken from under the Car. method of attaching the brake to the car frame and trucks;while Fig. 96 shows the truck frame for the magnetic track brakes are employed in a single-truck car, one beinglocated at the center of each side of the truck frame, and eachis made in three parts. The magnetic circuit proper is com-posed of steel, and the poles are shod with replaceable soft steelblocks. These steel shoes are beveled off at a sharp angle inorder to enable them to throw obstructions from the rails, andto ride easily over such slight irregularities in the rails as are BRAKING TESTS ON A SINGLE-TRUCK CITY CAR 341 not sufficient to derail the car. The shoes are brought as neartogether as possible without short circuiting the magnetic magnetomotive force for the track brake is furnished by amagnet winding of sufficient cr
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Keywords: ., bookauthorlouisian, bookcentury1900, bookdecade1900, bookyear1906
