"Edspot" combined Wheatstone bridge and potentiometer, type KN15, no.4831, by WPA ( Walden Precision Apparatus Ltd.), 1965-1975 "Edspot" combined Wheatstone bridge and potentiometer 1960-1979
Screened precision Wheatstone bridge, type T1097 serial no.68363 by H.W. Sullivan Ltd., London (6-decade, accuracy 0.003%) Screened precision Wheatstone bridge 1965
Wheatstone bridge with 50cm long wire, with four gaps, two closed by copper links, and with groove for sliding contact (slider missing) Wheatstone bridge with 50cm long wire 1900-1980
Wheatstone bridge by Otto Wolff, Berlin, no.3710, with ratio arms of 10, 100, 1000 and 10000 ohms and series arms of 100 000 ohms x 1 ohm in five dials, scaled in international ohms Wheatstone bridge by Otto Wolff 1900-1910