Direct reading two-range voltmeter
1900
Kelvin's patent multicellular Voltmeter no.501 by James White
Alioth's spring controlled voltmeter reading 0 to 250 volts
Electrostatic voltmeter
1893-1920
Universal voltmeter type 261 Serial No.116 made by Sapphire Research and Electronics Ltd
1955-1960
Avometer model 7 manufactured in 1956
1956
Crompton 6" voltmeter no.10707 - c.1899, 0 - 150v.
Crompton 8" voltmeter no.26725 - c.1910
Hot-wire voltmeter
1893
Cambridge thermionic voltmeter
1930
Kapp and Crompton alternating current voltmeter
Moving coil voltmeter
1894
Portable movable coil recording voltmeter no.157294
G.P.O. moving coil milliameter and voltmeter
Electrostatic voltmeter
Crompton 6" voltmeter no.179- c.1882, 0 - 300v.
circa 1882
Scalamp electrostatic voltmeter with built-in lamp and scale
1950-1970
Electrostatic voltmeter, no. 37
Early Thermionic voltmeter (Cambridge Inst. Co.)
1925
Marconi electronic voltmeter, type BD699A
Lord Kelvin's paralleling voltmeter
Vacuum Tube Voltmeter Type TF1041C No.53690/008
1962-1972
Laboratory standard a.c. and d.c. (electrodynamometer) voltmeter with 12 inch scale
1952
"Unipivot" d.c. Millivoltmeter No. L374523 by the Cambridge Instrument Co. Ltd.
1958-1968
Millivoltmeter of moving coil type with shunt
Voltmeter
1885
Elliott sector voltmeter 0-120V, serial No.1107651
One Ayrton-Perry voltmeter
Kelvin recording Voltmeter no. 7
Lahmeyer electrostatic voltmeter no. 116298
8" dial
Cardew hot-wire type Voltmeter no.E68
Siemens torsion type Voltmeter
Soames and Nalders patent Voltmeter
Portable moving coil voltmeter
1902
Eight inch dial
Kelvin recording voltmeter
Ferranti Cell-testing Voltmeter
1940-1950
Ferranti Voltmeter
1930-1950
Ferranti Voltmeter
1940-1960
Ferranti Voltmeter
1940-1960
Ayrton & Mather electrostatic gravity voltmeter by R.W. Paul
1893-1901
Pocket voltmeter, moving iron repulsion type
1910
Cardew's voltmeter, patent, no. 147 (Ediswan)
1890
Early moving coil voltmeter
1889
Silver voltmeter, for international ampere determination
1907-1930
Moving-coil voltmeter
1943
Sensitive electrostatic voltmeter, 1893
1893-1918
Voltmeter graduated to 100 volts
1887