Kelvin's electrostatic voltmeter by White
1892-1899
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
Valve millivoltmeter type 784
Self-recording voltmeter, by Richard Freres, 1892-1893
1892-1893
Polarised iron voltmeter
Hot-wire voltmeter
1895
Pattern K unipivot millivoltmeter
1912
Voltmeter, centre zero, scale 3-0-3V
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
Universal voltmeter type 261 Serial No.116 made by Sapphire Research and Electronics Ltd
1955-1960
Electrodynamic Voltmeter Type 47635/5 No 753360 made by H. W. Sullivan Ltd.
Voltmeter
before 1974
voltmeter
1924
Portable standard multi-range moving coil voltmeter
Avometer model 7 manufactured in 1956
1956
Crompton 6" voltmeter no.10707 - c.1899, 0 - 150v.
Hot-wire voltmeter
1893
Crompton 8" voltmeter no.26725 - c.1910
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
Millivoltmeter of moving coil type with shunt
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