. Electric railway journal . place about these few turns. Then, as therod revolves, the coil adjusts itself to the thread grooves inthe fiber pieces and acts as a screw, thus keeping the clampmoving along the rod at just the right winding pitch for addi-tional coils. Bearings are inserted and removed from arma-ture heads by a special screw press designed and built inthese shops. A circuit-breaker testing board has been installed in theseshops. It is the practice to test breakers in their operationposition before remounting on a car. The circuit-breakertesting equipment includes a master breake
. Electric railway journal . place about these few turns. Then, as therod revolves, the coil adjusts itself to the thread grooves inthe fiber pieces and acts as a screw, thus keeping the clampmoving along the rod at just the right winding pitch for addi-tional coils. Bearings are inserted and removed from arma-ture heads by a special screw press designed and built inthese shops. A circuit-breaker testing board has been installed in theseshops. It is the practice to test breakers in their operationposition before remounting on a car. The circuit-breakertesting equipment includes a master breaker, an ammeter anda series of load switches mounted on a slate panel. Theswitches are so connected with resistances that four differentloads up to 450 amp may be obtained. Then by the use of anauxiliary switch an additional load varying by multiples of15 may be applied up to 75 amp. The breakers to be testedare placed on a shelf mounted on trunnions, so that after con-nections have been made the shelf and the circuit breaker. Chicago Railways Shops—Outlet of Heating Duct in theErecting Shop bolted to it can be revolved into the position correspondingto that of regular operation. BLACKSMITH SHOP AND FOUNDRY The forging department has a floor space 114 ft. long by32 ft. wide. A view of a portion of this shop showing theheating and ventilating pipes is reproduced. The equipmentin the blacksmith shop includes nine forges, over each of whichis a hood surmounted, above the roof, by a 16-in. Kernschenventilator head. Two similar ventilators 12 in. in diameterexhaust the air from each of eight monitor skylights in theroof of this shop. In addition to this method of ventilationthe blacksmith shop is furnished with hot air in winter andcold air in summer from a forced ventilating system havingoutlets near each forge. The equipment of tools in the blacksmith shop includes threeFerguson oil furnaces, two No. 4 and one No. 2, supplied bythe Railway Materials Company, and one home-made oilf
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