. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . R-R-R-R-J A-PA-B A^-B A -B-B-B-B-B-M-JZ-J/^-brakes—-to the ground at G. To the left from fingerr> the path is iJ yU-U-F,-E-E-E-E-E-BD-G\;, the path IS 1. \ D- G Z^The No. 2 and No. 4 motors have one end of their field 74 ELECTRIC RAILWAYS. §25 grounded at E^ and E^. Tracing the circuit back, the double■E-F-1S-1S-1S\ ^ ^ /2S-A-A A- path is G- • >----<2S-A~-AA 17-17-17-17-17-1\ ,-S-S-8-R-R-R-R-R-R-P A -P A. 16-16-16-16-10BA-BA-B-B-B-B-B-M-A/
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . R-R-R-R-J A-PA-B A^-B A -B-B-B-B-B-M-JZ-J/^-brakes—-to the ground at G. To the left from fingerr> the path is iJ yU-U-F,-E-E-E-E-E-BD-G\;, the path IS 1. \ D- G Z^The No. 2 and No. 4 motors have one end of their field 74 ELECTRIC RAILWAYS. §25 grounded at E^ and E^. Tracing the circuit back, the double■E-F-1S-1S-1S\ ^ ^ /2S-A-A A- path is G- • >----<2S-A~-AA 17-17-17-17-17-1\ ,-S-S-8-R-R-R-R-R-R-P A -P A. 16-16-16-16-10BA-BA-B-B-B-B-B-M-A/-M-hrsikes-G. All fourmotors have both ends grounded, and are therefore inmultiple. No change is made after the first brake notch,except that resistance is cut out successively by fingersA^,, R^, R^, and R^. 96. Fig. 80 is a simple sketch showing the connectionsof the motors, plugs, blow coil, overload switch, and action of the overload switch is as follows: The magnetcoil carries the braking current of all the motors; if thiscurrent exceeds a certain predecided value, magnet M pulls nwm^. on its armature, thereby causing contacts c and x to touch,bringing together wires xyz and cdef; wire xjs con-nects to one end of all the motor fields and wire c d cfto the other end, so that when they touch, the motor fieldsare all short-circuited, depriving the motors of their abilityto generate. As soon as this happens, magnet M releases, § 25 ELECTRIC RAILWAYS. 75 opening the short circuit and allowing the fields to buildup again. 97. Releasing Bi-akes.—Full release of the brakes isaccomplished by passing a demagnetizing trolley currentthrough the brake coils. This operation is performedthrough the agency of finger D R and tips B D^, Fig. resistance between fingers D R and A, is called thedcuiagnetizing resistance, because it limits the strength ofthe demagnetizing current. The resistance is about GO demagnetizing current need be but very small, asthe
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectri, bookyear1901
