. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . ranged so that when the handle of the reverse switch pointsahead, the car will move ahead, and tvW versa. InFig. 8, r is the trolley; FB, the fuse box; Z .i, thelightning arrester; 7, the trolley connection on the rheo-stat; .S, the contact shoe that makes contact first with plate/, and can be moved around on resistance A between thelimits of plate 7^ and terminals 7vand L; F \<, the motor 14 ELECTRIC RAILWAYS. § 2^ field; X^ the reverse switch, to the two top binding posts ofwhic
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . ranged so that when the handle of the reverse switch pointsahead, the car will move ahead, and tvW versa. InFig. 8, r is the trolley; FB, the fuse box; Z .i, thelightning arrester; 7, the trolley connection on the rheo-stat; .S, the contact shoe that makes contact first with plate/, and can be moved around on resistance A between thelimits of plate 7^ and terminals 7vand L; F \<, the motor 14 ELECTRIC RAILWAYS. § 2^ field; X^ the reverse switch, to the two top binding posts ofwhich the armature A is connected; G is the ground wire,to which are connected the ground splices from the reverseswitch and from the lightning arrester. When 5 makescontact with P, the ordinary path of the current is T-F H-L A-T-S-P-R-K~F-2-3~A-]^-l, through the ground wire,to the ground at G. If the rheostat arm is turned arounduntil the shoe 5 reaches the dotted position S\ and thatpart of the resistance that has been passed over, marked r,cut out, a larger current passes through the motor, making Positive. it run faster and giving the car greater speed; if the con-tact shoe is still farther advanced until it reaches the dottedposition S and touches the contact plate K, all the resist-ance in R is cut out, the path of the current is T-FB-L to 6, and the motor runs at itsgreatest speed. If the reverse switch X is moved over tothe dotted position, it is easily seen that the direction of thecurrent through the armature will be reversed, while thatin the field will remain the same. The direction of motionwill, therefore, be reversed, because it must be remembered that in order to reverse the direction of motion of amotor, either the field or armature may be reversed, but 24 E T. ECr RIC R AILWAYS. 15 not both. It would tlo just as well to reverse the the field and K-ave that through the armature thesame, hut it is generally the practice to reve
Size: 2031px × 1230px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectri, bookyear1901
