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An electric gage has been developed for measuring the bores of small guns or tubes of about )~-inch inside diameter. Its operation depends on the mutual inductance of b 'o coils. The instrument has a solenoid mounted on each p rong of a fork . The current induced in the seco ndary varies inversely with the distance between the p rimary and secondary coil~. The gage is calibrated with rings of known diameter, and the diameter of a tube o r gun bo re is read directly on the dial of the instrument.

An electric gage for measuring the inside diameter of tubes