Ferranti resistance box
Resistance box
Resistance box
1912
Resistance box no.31445
Sullivan & Griffiths non-reactive resistance box
1952
Non-inductive resistance box
Plug resistance box by Townson and Mercer
1900-1980
Resistance box
1900-1940
Resistance box no. L 170297 by the Cambridge Instrument Co. Ltd.
1940-1950
E.T.Co. resistance box, in B.A. units
Resistance box 1 megohm
1938
Resistance box No.51580 by St. N.T.S's Fabrik
1875-1924
Resistance box
Silvertown resistance box No. 731 (1917)
1917
Ferranti Ltd type NS resistance box
Resistance box by Elliott Bros., London
Resistance box
Resistance box no.1077 marked "Refilled by Gambrell Bros"
Resistance box type K13B with "petticoat" plugs
Resistance box
1936
Plug type resistance box in German silver wire
1880
Ferranti resistance box.
Ferranti resistance box
Ferranti resistance box
Resistance box, 10 ohms, with cylindrical plugs
1900-1939
Plug type resistance box
Resistance box
1925-1930
Decade resistance box type A-25-P serial no. 178444
Resistance Box Type BG392AL
1955
Tapped resistance box
Callendar & Griffiths self-testing resistance box
1899