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Rumfords calorimeter, 1887. During his work in determining the efficiency of different fuels the Anglo-American scientist Benjamin Thompson, Count Rumford (1753-1814)
Mechanical advantage: The power of the lever, 1877. Lever of the second kind where effort is between the fulcrum and load. Resistance, A, is between power, B, and fulcrum, C
Aurora Borealis or Northern Lights observed from northern Norway, 10 October 1868, (1906). Aurorae are caused by the interaction of the particles in the solar wind with the Earths magnetic field
Leclanche wet cell, an early storage battery, 1896. Invented by the French engineer Georges Leclanche (1839-1882), this was an early form of the zinc carbon (dry cell) battery
Leclanche wet cell, an early storage battery, 1887. Invented by the French engineer Georges Leclanche (1839-1882), this was an early form of the zinc carbon (dry cell) battery
Voltaic battery (pile), 1887. A battery of the type invented by Italian physicist Alessandro Volta (1745-1827). It consists of a disc of zinc, a disc of copper, a disc of cloth moistened with acid
Children watching an outdoor scene through a camera obscura, 1887. From Natural Philosophy by A Ganot. (London, 1887)
