was £7.50
101520
Tin plate box with 130 mm sides. The vertical faces of the box are blackened, roughened, varnished and polished respectively. The top opening is 75 mm diameter and is fitted with a stopper. The apparatus is filled with water maintained at boiling point by a low bunsen flame. infra red sensors may be used to compare the relative radiant heat output from each of the four faces.
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