. Electric railway journal . e faces of the disks. This permits thespool to revolve independently of the shaft in case sufficienttorque is exerted to overcome the friction at the fiber strips,and this friction can be adjusted by tightening or looseningthe bolts which compress the springs holding the two sur-faces together. Ordinarily these bolts are tightened to apoint which will permit the armature to slip when the motoris under a draft of current in excess of 4000 amp. Thecircuit breaker forming a part of the control system is setat 3500 amp, and the enginemen are under instructions tooperat
. Electric railway journal . e faces of the disks. This permits thespool to revolve independently of the shaft in case sufficienttorque is exerted to overcome the friction at the fiber strips,and this friction can be adjusted by tightening or looseningthe bolts which compress the springs holding the two sur-faces together. Ordinarily these bolts are tightened to apoint which will permit the armature to slip when the motoris under a draft of current in excess of 4000 amp. Thecircuit breaker forming a part of the control system is setat 3500 amp, and the enginemen are under instructions tooperate with care after the draft of current reaches 2700amp, the latter point being indicated by a heavy red markon the ammeter in the cab. It is estimated by the operating officials that if all elec-trical repairs including electrical inspections for the sixty-six units were done at one point a force consisting ofone wireman, two electricians and five electricians helperswould be required. This would include the light repairs to. Pennsylvania Locomotives—General View of 2000-hpMotor the wiring and control apparatus now carried on in theSunnyside engine house. GENERAL Now that the necessity for keeping lost motion or bindingout of the running gear is understood, the riding qualitiesof this type of electric locomotive are actually better thanthose of the best types of steam locomotives. Little pound-ing or nosing takes place. The maintenance costs, as might be expected on accountof the simplicity of the design, together with its adherence March 15, 1913.] ELECTRIC RAILWAY JOURNAL 461 to the principle of the high center of gravity now gen-erally accepted as a requisite for high-speed electric locomo-tives, are very much less than those for steam six months between June and November of the pastyear the maintenance costs per unit were as follows: Maintenance Costs of Electric Locomotive Units . Cents per Mile During 1912 Mechanical Electrical Total June
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