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Dear All, I heat the house mostly with wood burned in a fireplace insert and, apart from some air circulation in under the fire box, up behind it and out over the top, most heating is radiant off of the top. For decades I have used a Swedish Christmas heat mill, sold for candles, which I adapted for stove top use, as a measure of heat release rate. In recent decades it turned less frequently and for several years not turned at all even with a brisk fire so I suspected wear and increased friction at pivot points. The stove top had become dull grey in color so to improve appearance I located a source of blacking last fall but it could be applied only to a cold stove so was applied to the top, on first recent warm morning this spring, and the increase in heat radiation from the top was dramatic. With just a token fire that Swedish heat mill was spinning full tilt ! This I assume was a practical demonstration of increased radiation from a black surface (Black Body Radiation ?). And all along I had imagined that stove blacking was just for appearance. Yt, DW, Kentville
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