Joule's original calorimeter ('paddle-wheel apparatus') used in determining the mechanical equivalent of heat. Copper mixing vessel with vane and spindle mechanical equivalent of heat apparatus Heat 1876
Wire electromagnet core made by James Joule for electromagnetic engine, c.1839. Used to experiment on the design of wire most suited for Joule's electromagnetic engine. The practical advantage of the solid electromagnet outweighed the wire magnet. Described in Joule's 1839 paper 'On the use of Electro-magnets made of iron Wire for the Electromagnetic Engine'. Sixteen square iron wires bound together and bent into shape. Has lost its envelope of cotton, together with 16 feet of covered copper wire 1/16 inch in diameter. Electromagnet Core made by James Joule Scientific Instruments & Research 1839
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 made by James Joule for experiments on lifting power Scientific Instruments & Research 1840
