Rumford photometer or shadow photometer, vintage ingraving - Vintage Nostalgia
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.

$ 1.99$ 35.99 Select options
Auxanometer: how to measure the growth of plants - Vintage Nostalgia
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

$ 1.99$ 35.99 Select options