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ods of control th at were previously cite d .T he circuit is versatile in that th e control voltage may be inserted in either the presetting circuit or the resetting circuit, with full ou t pu t at either zero or full control voltage, as arranged by the designer's choice of comp onents. The circuit may even be arranged so that different control Paper 53-356, r ecomm ended by the Al E E Television a nd A ural Broa dc as tin g Syst ems Committee a nd approved by t h e A lEE Com mi t t ee on T echnical Ope rations for presenta tion at t he AlEE P aci fic General Meeti ng, Va nco uv er, B .C., Canada, September 1-4, 1953. Manuscript submitted Jun e 3 , 1953 ; made available (or printing J uly 13 , 1953. J . M . BARSTOW and H . N . C HRISTOPHER a re wi t h the Be ll Telep ho ne Laboratories, Inc., N e w Yo rk, N . Y .T he authors wish to ac know le dge the very able assistance given by A . D . Fowler of the Bell Telephone Laboratories , I nc ., in rev iewing th e test results and pro vi ding va luable comments du rin g t he preparation of the m a ter ia l (or this paper. J AN U ARY 1954Barstow, Christopher-Measurement of M onochrome Video I nterf erence

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