1931 J. A. Moyer & J. F. Wostrel xii. 601 A direct-current galvanometer, protected by a suitable shunt, is used as a null indicator.
1958 E. U. Condon & H. Odishaw iv. v. 66/2 Null determinations in d-c measurements are almost invariably made with a D'Arsonval-type galvanometer.
1962 94/2 The precision of a bridge measurement depends on the sensitivity of the null detector.