Mirror galvanometer for the transatlantic telegraph, 1858
1858
Lord Kelvin's 'ironclad' marine galvanometer, 1865-1866
1865-1866
Thomson's mirror marine galvanometer, 1858
1858
Trough battery, 1801-1838
1801-1838
‘Medico-Electrical Machine’ by Nairne and Blunt
1782-1793
Set of magnetical apparatus in case, by Adams
1790
A.C. ammeter model 155
Small superconducting electromagnet
1965
Moving magnet gravity control "detector" galvanometer with 2
Direct reading capacity bridge by Leslie Dixon & Co.
1922-1940
Ayrton & Mather electrostatic gravity voltmeter by R.W. Paul
1893-1901
Plug type bridge box and galvanometer
Pocket voltmeter, moving iron repulsion type
1910
Wire rheostat, 50 ohm 6 amp by Robert W. Paul
1900-1919
Mercury interrupter
1860-1890
Resistance box
1912
App's clockwork interrupter
1890
Potentiometer, by Gambrell Bros. & Co. Ltd.
Cardew's voltmeter, patent, no. 147 (Ediswan)
1890
Early moving coil voltmeter
1889
Weston Normal Cell
1928
Resistance divider box for use with potentiometer
Oscillograph, Cambridge Instrument Co. No. L 28466
1930
Sub-standard 1000 ohm resistance
1930
Rymer-Jones key
Portable standard multi-range moving coil voltmeter
Motor driven oscillograph unit with "linear sweep" mirror
1925
Electrostatic oscillograph
1925
Weston normal cell by Cambridge Instrument Co.
Battery of nine Grove cells
Siemens dynamometer
1900
Twin element permanent magnet oscillograph in box
1910
Silver voltmeter, for international ampere determination
1907-1930
Astatic needle galvanometer
1840-1877
Kelvin astatic mirror galvanometer
1901-1913
Lindemann electrometer
1924
Standardizing and switching apparatus
1900
Boys' contact electricity electrometer, c. 1891
1891
Siemens experimental galvanometer
1900
Astatic galvanometer by Elliott Brothers, 1872.
1872
Fixed parallel plate device for measuring positive emission currents
1907-1908
Rotating spark
1872
Sectioned induction coil
1874
Leaf electrometer with ionization chamber
1900
Resistance box by Elliott Bros., London
Wheatstone bridge
1932
Quiz electrostatic air filter
1981
Dipping needle with arc
1872
Medical magneto-electric machine
1854-1890
Blondel triple bifilar oscillograph, 1900
1900