File:The street railway review (1891) (14573534987).jpg

Identifier: streetrailwayrev07amer (find matches)
Title: The street railway review
Year: 1891 (1890s)
Authors: American Street Railway Association Street Railway Accountants' Association of America American Railway, Mechanical, and Electrical Association
Subjects: Street-railroads
Publisher: Chicago : Street Railway Review Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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attached rigidly to the counter-shaft, is a band of springsteel. The two ends of this band are fastened to a togglejoint connected to a 45-lb. armature of an electro magnet.The coils of this magnet consist of 400 turns of No. 7 B.& S. wire in series with the armature of the motor. Whenthe current is turned on for hoisting purposes the armatureof the electro-magnet is drawn up over a 1 )/i-m. air gap andthe band around the brake pulley is loosened. As soon asthe current is turned off the armature of the electro-mag-net drops, turns the toggle joint and clamps the band tightaround the pulley, bringing the hoisting drum to rest veryquickly. For light work a supplementary hoisting hookhas been provided and the wire rope wound around thedrum. A pawl is attached to one of the gears so that forlifting light pieces the drum revolves four times as fast asit does for heavy lifting. A Sprague controller was placed in the cab for eachmotor, the electrical connections being as shown in Fig. 2.
Text Appearing After Image:
FIG. I.—ELEVATION OF TRAVELING CRANE. the heaviest parts of the machines. This would be verytedious and laborious b) hand and plans were made to useelectricity for operating one of the cranes. W. A. Hopkins,the electrician at the Western avenue station, designed theelectrical connections and John Murphy, master mechanic,arranged the alterations for the traveler and the details ofconstruction. All the material was taken either from thescrap-pile or from the store-room. A trolley wire, of standard dimensions, was suspendedfrom the roof trusses the entire length of the engine roomand connected to a 500-volt circuit. Upon the bridge wasmounted an old Nuttall trolley base and rod. Three 15-h. p.Sprague streetcar motors were used to run the bridge and thetraveler and to lift the hook. A cab, 4 x 6 ft. and 10 ft. deepwas built at one end of the crane and contains the controll-ers and rheostats. For moving the crane along the lengthof the engine room a motor was mounted on the floor of The

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