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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 Core

1835-1845

Electromagnet made by James Joule for experiments on lifting power

1840
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