A thermal radiation probe was constructed and tested in pulverized-coal-fired furnaces. A rotatable sensing head on the side of a water-cooled probe permitted measurement of radiant flux within a 12.5 deg cone from any desired direction to a point within a furnace. A response curve for a corner-fired furnace showed radiant flux of 130,000 Btu per sq ft, hr, when viewing flame, and 60,000 Btu per sq ft, hr, when sensing wall reflection. Selected drawings of probe construction are given. Additional drawings are available from the U. S. Bureau of Mines.

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