"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
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
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