. Electric railway journal . i in. as follows: Insulation value up to 6000 volts (the potential available in the shops) ; breakdown potentialbetween 5000 volts and 6000 volts; breakdown potentialbetween 3000 volts and 4000 volts; breakdown potential of3000 volts or less. One of the interesting results shownby the test was that the best electrical varnish was alsosuperior mechanically. After being baked for 300 hours at190 deg. Fahr., it was still pliable, elastic, non-cracking andnon-scaling when the cloth was creased or torn. The testsmade on four air-drying varnishes
. Electric railway journal . i in. as follows: Insulation value up to 6000 volts (the potential available in the shops) ; breakdown potentialbetween 5000 volts and 6000 volts; breakdown potentialbetween 3000 volts and 4000 volts; breakdown potential of3000 volts or less. One of the interesting results shownby the test was that the best electrical varnish was alsosuperior mechanically. After being baked for 300 hours at190 deg. Fahr., it was still pliable, elastic, non-cracking andnon-scaling when the cloth was creased or torn. The testsmade on four air-drying varnishes resulted in the selectionof the same makers Ajax black air-drying is used at the inspection and maintenance shops for. BOTTOM HALF Note: | Must be allowed forfinishing on uli surface marked / Fig. 1—Brooklyn Power Equipment—Malleable Iron GearCase for Westinghouse 68 Motor The elevated armatures wound with ribbon or bar cop-per have the coils made up with mica insulation in placeof the usual oil linen. This involves greater first cost, butpays through the material reduction of maintenance trou-bles All newly wound armatures, elevated or surface,are given an insulation breakdown test of 2000 volts ,and all repaired armatures a breakdown test of 1000volts After testing 10 armature varnishes, the company adoptedAjax black baking varnish for dipping armature, field PINION END BRACKETOF MALLEABLE IRON Fig. 2—Brooklyn Power Equipment—Gear Case Bracketsfor Westinghouse 68 Motor touching up and painting armatures, fields and control ap-paratus insulation. MOTOR BEARING FITS The motor shells of West. 68 motors are being boredout to secure larger axle and armature bearing fits, as theold fits ha
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