Bolometer

Designed to measure heat radiation from the sun, this device consists of an aluminium tube with a blackened front enclosed in a cardboard tube blackened on the inside. Includes a borehole for a thermometer.
Aluminium tube: 30 mm x 40 mm dia. approx.
Cardboard tube: 195 mm x 50 mm dia. approx.
Weight: 350 g approx.
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