Motion Picture Herald (Mar-Apr 1947)

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HERE MOTORS icisf be almost human! i designing of a carbon feed i control mechanism that will lire stable arc operation reres exhaustive testing by ins of intricate and sensitive oratory equipment in the ids of highly trained techlans of long experience. )wn is one of many checks bemade in The Strong Electric Corporation laboratories to determine the response of the feeding motor speed to any variations in arc characteristics which result from the burning away of the carbons. The data compiled as the result of these tests are employed to calculate the exact motor speed variations necessary to maintain a uniform arc gap length, hold the arc crater at the optical focus of the reflector and establish the proper magnetic field direction and strength surrounding the arc. THE STRONG ELECTRIC CORP. 87 City Park Avenue Toledo 2, Ohio THE WORLD'S LARGEST MANUFACTURER OF PROJECTION ARC LAMPS"