Lord Kelvin's electrostatic voltmeter (vertical type) no. 20623
1913-1920
Self-recording voltmeter, by Richard Freres, 1892-1893
1892-1893
Voltmeter
before 1974
Weston direct-reading alternating and direct current voltmeter
1936
Electrostatic voltmeter
1888
Hot-wire voltmeter
1895
Kelvin multicellular electrostatic voltmeter
1892-1900
Voltmeter, centre zero, scale 3-0-3V
Direct reading two-range voltmeter
1900
Solartron digital voltmeter
1970
Moving-coil voltmeter in angled wooden stand
1945-1954
Scalamp electrostatic voltmeter with built-in lamp and scale
1950-1970
Marconi instruments valve voltmeter
Electrostatic Precision Voltmeter made by Trub Tauber
1962
Sensitive electrostatic voltmeter, 1893
1893-1918
Avometer model 7 manufactured in 1956
1956
Portable standard multi-range moving coil voltmeter
Mather electrostatic voltmeter
1890-1910
Cambridge thermionic voltmeter
1930
Lord Kelvin's electrostatic voltmeter
circa 1880
Digital voltmeter type LM901 serial number 108293 by the Solartron Electronic Group
1960-1965
Lord Kelvin's paralleling voltmeter
Digital voltmeter
Electrostatic voltmeter
1893-1920
Kelvin's electrostatic voltmeter by White
1892-1899
electronic millivoltmeter Galvamp type 391-2
1966
Sangamo Weston Ltd voltmeter
Cardew's voltmeter, patent, no. 147 (Ediswan)
1890
Pocket voltmeter, moving iron repulsion type
1910
Electrostatic voltmeter as used at RAE.
Ferranti BS1 Voltmeter
1910-1930
One Ayrton-Perry voltmeter
Ferranti Cell-testing Voltmeter
1940-1950
Voltmeter marked with psychology symbol
1970-1985
Silver voltmeter, for international ampere determination
1907-1930
Early moving coil voltmeter
1889
Kelvin-White electrostatic voltmeter
1901-1907
Early voltmeter
Pattern K unipivot millivoltmeter
1912
Recording electrodynamometer voltmeter
Voltmeter and ammeter indicating the direct pull of a solenoid and tubular core
Moving-coil voltmeter
1943
Electrostatic voltmeter
Electrostatic voltmeter no 16487.
1913-1947
Ayrton-Mather single needle electrostatic voltmeter
1890
Ferranti voltmeter
1930
Siemens torsion type Voltmeter
Polarised iron voltmeter
Moving-coil voltmeter
1951
moving iron voltmeter
circa 1939