Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

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456 MOTION PICTURE HANDBOOK the left. About one minute before the end of the reel is reached he throws the switch to the right, starting the arc on machine No. 2 through the rectifier, while machine No. 1 is transferred to the alternating current supply of the compensator, and the reel is completed in this manner. This gives the carbons on No. 2. time to burn to their proper brilliancy on D. C, ready to begin the second reel. The process is repeated toward the end of the second reel on machine No. 2. The procedure may, if desired, be reversed; that is to say, starting machine No. 2 on alternating current and later changing it to direct current. However, the first mentioned will be found more satisfactory, as it takes a short while for the direct current to burn the crater properly. Always do it just as though the boss was around.