Electromagnet used by James Joule in about 1839 for experiments on the attracting power of magnets. Iron bar is wound with '88 yards of covered copper wire 1/16" diameter.' One of a pair of magnets used to test the law that 'the attractive force of two electromagnets is directly proportional to the square of the electric force to which the iron is exposed', i.e. M (attraction) = E squared (electric current) x W squared (length of wire). Results showed that as the length of the bar is increased, so the power of attraction increases. Electromagnet used by James Joule in about 1839 for experiments on the attracting power of magnets
Electromagnet originally used for magnetising compass needles Electromagnet originally used for magnetising compass needles
Large superconducting electromagnet, made at the Central Electricity Research Laboratories, between 1963-1969 Large superconducting electromagnet 1963-1969
Quarter scale model of Mullard large adjustable 'Ticonal' permanent magnet assembly, type 1148/1, on felt covered wooden base with perspex cover, unsigned, British, 1950-1954 Model of Mullard 'Ticonal' permanent magnet assembly 1950-1954
"Nivoc" electromagnet by W. and J. George and Becker Ltd., Birmingham and London "Nivoc" electromagnet by W. and J. George and Becker Ltd. 1950-1954
Large electromagnet by Ducretet, formerly the property of Spottiswoode Large electromagnet by Ducretet 1879-1883
Superconducting electromagnet, prototype of the magnet used in medical magnetic resonance imaging machines, made by Oxford Magnet Technology Limited, Wharf Road, Eynsham, Witney, Oxon, OX18 1BP, England, 1989-1990. Superconducting electromagnet 1989-1990
Electromagnet type E serial no. 7156/6 by Newport Instruments, Newport Pagnell, England Electromagnet Type E 1960-1979
Large electromagnet by Nalder Bros. and Co., no.4947, fitted with bracket for suspending crystals when measuring diamagnetic susceptibilities Large electromagnet by Nalder Bros. and Co 1881-1910