Note 59 — Of the London Chimney-Sweepers.

The quantity of soot deposited depends greatly on the length, draught, and irregular surface of the chimney. The kitchen flue yields by far the most soot for an equal quantity of coals burnt, because it is of greater length. The quantity above cited is the average yield from the several chimneys of a house. It will be seen hereafter that the quantity collected is only 800,000 bushels; a great proportion of the chimneys of the poor being seldom swept, and some cleansed by themselves.