Trough battery, 1801-1838
1801-1838
‘Medico-Electrical Machine’ by Nairne and Blunt
1782-1793
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
Set of magnetical apparatus in case, by Adams
1790
Megger Major insulation tester
1960-1969
A.C. ammeter model 155
Moving magnet gravity control "detector" galvanometer with 2
Moving iron ammeter with torsion head
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
Moving iron meter
1927
App's clockwork interrupter
1890
Moving-coil ammeter of a commercial design modified by E.H.W. Banner
1928
Potentiometer, by Gambrell Bros. & Co. Ltd.
Cardew's voltmeter, patent, no. 147 (Ediswan)
1890
Early moving coil voltmeter
1889
Resistance divider box for use with potentiometer
Oscillograph, Cambridge Instrument Co. No. L 28466
1930
Sub-standard 1000 ohm resistance
1930
Rymer-Jones key
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
Liquid crystal display as used in sthe Scopex Voyager oscilloscope
1982
Lindemann electrometer
1924
Standardizing and switching apparatus
1900
Astatic galvanometer by Elliott Brothers, 1872.
1872
Rotating spark
1872
Sectioned induction coil
1874
Resistance box by Elliott Bros., London
Leaf electrometer with ionization chamber
1900
Wheatstone bridge
1932
Blondel triple bifilar oscillograph, 1900
1900
Medical magneto-electric machine
1854-1890
Device for measuring lateral spreading of electrons
1907-1908
Helmholtz's quadrant electrometer
1876
Byrnes' cell, by Ladd
1878-1883
Leyden jar
1851-1925
Tangent galvanometer
1864-1886
Wheatstone bridge, simple slide-wire pattern
Electrometer, specially designed as an electrostatic wattmeter
1900
Moving-magnet null galvanometer
Hammer break interrupter by Ducretet & Lejeune
Callendar and Griffiths bridge No.4317
1906-1907