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. A device is described which permits a significant increase in the frequency of the osci llatIOns of the beam of a balance, thereby shortening the interv al during which upsetting ambicnt condit ions can act. The device is a servo-driven photoelectric follo\\"up system responding to t he position-modulated light signal refi ectecl from a mirror attached to the balance 12 ft a"'ay from t he photoccll. Reproducibili ty in observin g the positioll of the light beam is 0.001 in . or less.

A photoelectric followup and recording system, and its application to remote observations of the beam in high-precision balances