. Electric railway journal . and reduce the lifeof the insulation. The machines, therefore, must be cleaned be-fore they have cooled and the oil has had a chance to hardenor to be absorbed by the insulation. INSTRUMENT CAUHRATION AND POWER RECORDS On a system as extensive as the Metropolitan the number ofunits operated and of feeders in service is very large, conse-quently, many indicating and recording instruments are neces-sary. The calibration of these instruments requires a corps ofspecialists. The instrument foreman has also been trained toact as a substitute for (lie operating foremen wh
. Electric railway journal . and reduce the lifeof the insulation. The machines, therefore, must be cleaned be-fore they have cooled and the oil has had a chance to hardenor to be absorbed by the insulation. INSTRUMENT CAUHRATION AND POWER RECORDS On a system as extensive as the Metropolitan the number ofunits operated and of feeders in service is very large, conse-quently, many indicating and recording instruments are neces-sary. The calibration of these instruments requires a corps ofspecialists. The instrument foreman has also been trained toact as a substitute for (lie operating foremen when the latterare absent. The instrument men have charge of the instru-ments installed on feeders supplying power from the Metro- 898 ELECTRIC RAILWAY JOURNAL. [Vol. XXXV. No. 21. politan station to the Third Avenue lines as well as to the linesof other companies and also check the instruments installedon feeders supplying power to the Metropolitan from the ThirdAvenue station. The checking of these instruments is of special. Metropolitan Electrical Department—New Condenser atNinety-sixth Street Station importance as a slight error in their calibration might result ina considerable difference in the charges made for power boughtand sold. The exciter-board operator at Ninety-sixth Street, in addi-tion to having charge of his own board, gets the records of all
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