. The Street railway journal . FIG. 4.—DIAGRAMMATIC REPRESENTATION OF OPERATION the car, helping over grades, for use in switching purposes andfor the operation of the brakes. 3. By this method of control I secure an infinite number ofspeeds from zero to the maximum speed of the car, which mayor may not be at the synchronous speed of the motor, for withthe air-controlling mechanism working compressing, the speedsbelow synchronism are maintained, and by reversing the di-rection of the air through the controller speeds above syn-chronism may be attained for reasonable distances. This fea-ture gi
. The Street railway journal . FIG. 4.—DIAGRAMMATIC REPRESENTATION OF OPERATION the car, helping over grades, for use in switching purposes andfor the operation of the brakes. 3. By this method of control I secure an infinite number ofspeeds from zero to the maximum speed of the car, which mayor may not be at the synchronous speed of the motor, for withthe air-controlling mechanism working compressing, the speedsbelow synchronism are maintained, and by reversing the di-rection of the air through the controller speeds above syn-chronism may be attained for reasonable distances. This fea-ture gives to the alternating-current motor the element abso-lutely essential for practical railway work, for it permits a caror train to ascend a grade at any speed with the motor workingat its maximum efficiency and imparting its full torque to thecar. When descending the grade the motor may utilize its full. FIG. 5.—OUTSIDE VIEW OF ELECTRIC MOTOR FIG. VIEW OF ELECTRIC MOTOR tant, where were located the car houses in which the pre-liminary experiments were made. The conditions under which the first application of the sys-tem took place having thus been set forth, it may be well, inorder to get clearly before the reader the principles on whichthe system is based, to quote here the statements made by mebefore the Great Barrington Convention on June 19, 1902, asfollows: power drawn from the line in compressing air, or it may beused to compress air with the stored energy of the train,thereby acting as a brake. 4. By virtue of the air storage, feature each car becomes anindependent unit, and capable, in case of loss of current fromthe line, of running a reasonable distance without contact withthe working conductor. This feature will enable a car to workon a high-tension trolley wire or active conductor over private 42 STREET RAILWAY JOURNAL. [Vol. XXIII. No. i. right of way, and a
Size: 2008px × 1244px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
