In Washington last week Hamilton Watch Co.'s Research Director George Paul Luckey told the Horological Institute about the "time microscope," a device has contrived for making quick tests of a watch's accuracy. At split-second intervals a revolving reflector flashes a light on the watch's balance wheel at the centre of its backward & forward movement. If the balance wheel's speed is the same as the reflector's, the arm looks stationary (stroboscopic effect). Otherwise a double image appears and indicates that the watch must be readjusted. In a one-minute test the time...
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