What’s that dark stain on the ceiling? Look up. Do you see what appears to be soot on the drywall? How about if you look carefully at the point where exterior walls meet the ceiling? What you are ...
MAY I suggest a distinct, if not an alternative cause for Prof. E. B. Poulton's soot figures in NATURE, April 27th? The ceiling plaster is very porous, except where it is in contact with the joists, ...
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