^ … Fig. 13.—Graphite black body and electric furnace type, it is placed at any convenient distance A, say 100cm from D and usually focused on the opening of the inmostdiaphragm. This opening is made of sufficient diameter so thatits image just covers the receiver. The sizes of all other dia-phragms…
Thermometry, pyrometry and calorimetry · Heat flow, thermal and thermodynamic processes
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