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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.
Auxanometer: how to measure the growth of plants
XIX century illustration describing the auxanometer, apparatus for measuring the growth of plants. A wire is fixed to the the plant apex on one end and a dead-weight on the other. As the plant grows, the pulley rotates and the … Continued