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Rumford photometer or shadow photometer, vintage ingraving
Rumford photometer or shadow photometer invented by Sir Benjamin Thompson, Count Rumford, is an instrument which measures the intensity of light comparing different light sources.
Magnesium flash lamp, XIX century
Antique magnesium flash lamp using pure magnesium, it consists of three part: a large flat alcohol lamp, a receptacle for magnesium and a large hand pressure bulb all joined together. A single pressure of the bulb gives an intense and … Continued