Electromagnet for a crane, by Witton Kramer Electromagnet for a crane, by Witton Kramer Lifting & Mechanical Handling
Electromagnet used by James Joule, c.1855. Part of Electromagnet Scientific Instruments & Research 1855
Electromagnet used by James Joule, c.1860. Part of Electromagnet Scientific Instruments & Research 1860
Replica of an electromagnet used by James Joule, the original of which was used in 1843 to demonstrate the heating effect of an electric current. Horizontal glass cylinder wound with cotton fabric. Armature of metal strip bound together and wound with cotton-covered copper wire. Replica of James Joule's Electromagnet Scientific Instruments & Research
Electromagnet core used by James Joule, c.1860. Cylinder of concentric layers of soft iron insulated by cotton tape. Electromagnet Core Scientific Instruments & Research 1855-1865
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 Scientific Instruments & Research
Electromagnet core made by James Joule for electromagnetic engine. Used to experiment on the shape of wire most suited to Joule's electromagnetic engine. The practical advantage of the solid magnet outweighed the wire magnet. Described in Joule's 1839 paper 'On the use of Electro-magnets made of iron Wire for the Electromagnetic Engine' Electromagnet core Scientific Instruments & Research 1835-1845
Electromagnet made by James Joule for experiments on lifting power, c. 1840. One of a number of electromagnets constructed to investigate how much work could be extracted, Experiments carried out at Salford brewery. Long cylindrical piece of iron divided in two longitudinally; one half wound with cotton-covered copper wire, other half wound only in centre. Both halves have eyelet drews along their length. Electromagnet Scientific Instruments & Research 1840
Electromagnet core used by James Joule, c.1860. Made of concentric layers of soft iron insulated by cotton tape. Electromagnet Core Scientific Instruments & Research 1855-1865
Electromagnet used by James Joule, c.1855. Part of Electromagnet Scientific Instruments & Research 1855
Electromagnet type E serial no. 7156/6 by Newport Instruments, Newport Pagnell, England Electromagnet Type E Electricity and Magnetism 1960-1979
Electromagnet used by James Joule, c.1840. Electromagnet used by James Joule Scientific Instruments & Research
Electromagnet used by James Joule, c.1840. Electromagnet used by James Joule Scientific Instruments & Research
Part of electromagnet used by James Joule, c.1855. Part of Electromagnet Scientific Instruments & Research 1855
Electromagnet core used by James Joule, c. 1839 to measure electromagnetic attraction. Made up of 16 square sections of iron wires and covered in strips of cotton. Deduced that the attractive force of two electromagnets for one another is directly proportional to the square of the electric force to which the iron is exposed; or if E is electric current, w the length of wire and M magnetic attraction, M=E squared x W squared. Originally 'wrapped with 22 yards of covered wire' now missing. Electromagnet Core Scientific Instruments & Research 1839
