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Small frame containing two kinds of spider's thread

Joule's Electro-Magnet (Calorimeter) Apparatus, 1843

1843

Electromagnet Core made by James Joule

1839

Joule's Cast Iron Friction Apparatus (Calorimeter), 1849

1849

Electromagnet made by James Joule for experiments on lifting power

1840

Electromagnet Core

1835-1845
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

1876