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3weep 63N7 twin triode achromatic adjusted aluminum angle axis of rotation axis of support beam brass disc carborundum Cathode circuit charging plate cross hair cylinder desired axis diameter drive driver amplifier end mirrors feed flat frequency Future plans include green light grid grinding powder group velocity Half silvered mirror horizontal damping inch iron disc lapping plate light in air lucite machine magnetic flux matrix mirror faces Mirror Ml mirror parallelism mirror surfaces mounted multivibrator negative voltage ooil optical grinding optical system optical window oscillator output is fed parallel light path trnversals pentode phase splitting circuit pitch plane polishing power supplies precessed quenched in oil radial resistance rotating mirror rotational speeds rotor rotating rotor shape sbout set screws sharp pinnacle signal stability support axis support solenoid sylphon template hole thet transparent liquids tube tuned to 20 velocity of light velocity spectrum voltage divider circuit