Voltmeter
before 1974
Self-recording voltmeter, by Richard Freres, 1892-1893
1892-1893
Lord Kelvin's electrostatic voltmeter (vertical type) no. 20623
1913-1920
Hot-wire voltmeter
1895
Electrostatic voltmeter
1888
Weston direct-reading alternating and direct current voltmeter
1936
Direct reading two-range voltmeter
1900
Kelvin multicellular electrostatic voltmeter
1892-1900
Voltmeter, centre zero, scale 3-0-3V
Scalamp electrostatic voltmeter with built-in lamp and scale
1950-1970
Solartron digital voltmeter
1970
Moving-coil voltmeter in angled wooden stand
1945-1954
Electrostatic Precision Voltmeter made by Trub Tauber
1962
Marconi instruments valve voltmeter
Lord Kelvin's electrostatic voltmeter
circa 1880
Portable standard multi-range moving coil voltmeter
Sensitive electrostatic voltmeter, 1893
1893-1918
Avometer model 7 manufactured in 1956
1956
Cambridge thermionic voltmeter
1930
Paterson & Cooper Ayrton & Pererry's voltmeter
1900
Moving coil voltmeter by Everett, Edgcumbe & Co. Ltd.
Mather electrostatic voltmeter
1890-1910
Electrostatic voltmeter
1893-1920
Lord Kelvin's paralleling voltmeter
Digital voltmeter type LM901 serial number 108293 by the Solartron Electronic Group
1960-1965
electronic millivoltmeter Galvamp type 391-2
1966
Digital voltmeter
Kelvin's electrostatic voltmeter by White
1892-1899
Electrostatic voltmeter as used at RAE.
Cardew's voltmeter, patent, no. 147 (Ediswan)
1890
Sangamo Weston Ltd voltmeter
Pocket voltmeter, moving iron repulsion type
1910
Early voltmeter
Voltmeter marked with psychology symbol
1970-1985
Silver voltmeter, for international ampere determination
1907-1930
Early moving coil voltmeter
1889
Ferranti BS1 Voltmeter
1910-1930
Ferranti Cell-testing Voltmeter
1940-1950
One Ayrton-Perry voltmeter
Kelvin-White electrostatic voltmeter
1901-1907
Moving-coil voltmeter
1943
Recording electrodynamometer voltmeter
Pattern K unipivot millivoltmeter
1912
Voltmeter and ammeter indicating the direct pull of a solenoid and tubular core
Electrostatic voltmeter
Ferranti voltmeter
1930
Polarised iron voltmeter
Voltmeter, permanent magnet type
1881-1882
Ayrton-Mather single needle electrostatic voltmeter
1890
Ferranti Voltmeter A427F
1920-1950