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Dear All, Â Â Â 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. Â Â Â 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. Â Â Â 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 ! Â Â Â 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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