Scalamp electrostatic voltmeter
1960-1979
Electrostatic voltmeter
J White Kelvin patent multicellular voltmeter
circa 1897
dial multi-cellular electrostatic voltmeter
circa 1896
Kelvin's multicellular electrostatic voltmeter No.20517
1913-1947
mirror reflecting electrostatic voltmeter
multi-cellular voltmeter
circa 1896
J White Sir W Thomson's patent electrostatic voltmeter
circa 1895
Quadrant electrometer
circa 1935
electrostatic voltmeter
circa 1902
Electrostatic voltmeter made by Kelvin & James White Ltd
1904
Kelvin, Bottomley & Baird Limited electrostatic voltmeter
1909
Electrostatic voltmeter made by Kelvin & James White Ltd
1900
electrostatic voltmeter
circa 1890
Electrostatic voltmeter made by Siemes & Halske AG
1950
Electrostatic voltmeter
1940
Salford Electrical Instruments electrostatic voltmeter
1910