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Reference.org
Bolometer
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<p>A bolometer is a device for measuring <a href="/facts/Radiant_heat/1PD9jtCv">radiant heat</a> by means of a material having a temperature-dependent <a href="/facts/Electrical_resistance/hxSt0UAj">electrical resistance</a>. It was invented in 1878 by the American astronomer <a href="/facts/Samuel_Pierpont_Langley/jHj588ru">Samuel Pierpont Langley</a>. </p>