distances would be approximately 9 per cent, and if thepyrometer were calibrated at 80 cm distance and used at 300 cm,the temperatures thus measured would be too high by approxi-mately y^ X 9 per cent = 2 per cent of the absolute temperature,i. e.,350ati5oo0C. This particular pyrometer may be made… … 152 Bulletin of the Bureau of Standards [Vol. 12 so that the cone of rays diverging from A and passing through thelimiting diaphragm B will always completely intersect the surfaceof the gold mirror at the shortest focusing distance u employed(i. e., the longest distance v). In the discussion of the…
Thermometry, pyrometry and calorimetry · Heat flow, thermal and thermodynamic processes
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