alizedexperimentally. The ends of the porcelain thermocouple tubes,having a very low emissivity in the visible spectrum, are indis-tinguishable from the surrounding graphite walls at 13000 C.Optical pyrometers, which have been calibrated by sighting intoa Lummer-Kurlbaum black-body furnace or with… … Fig. 14.—Porcelain black body E and F to within ±5°, when sighted on the inner diaphragm D.And finally the two inner diaphragms of the graphite black bodyare easily made indistinguishable to the eye from each other orfrom the openings of the diaphragms. All these conditionswould indicate that…
Thermometry, pyrometry and calorimetry · Heat flow, thermal and thermodynamic processes
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