Electrically maintained tuning fork, Tinsley type 18030. Made by H. Tinsley & Co., England, circa 1950.

Used for putting time markings on recorder charts, especially in physiological work.

Physical Description

Consists of precision tuning fork, with adjustable weights on tines, multiple electrical make & break contacts, lever controlled fork movement clamp. In wooden box with glass top. Contents from List of Parts Field: Trade Literature

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