Abstract
When complaints of a smoke nuisance arise it is very important to be able to identify the source. The aim of the paper is to indicate possible methods of overcoming the difficulties of correct identification. Consideration is given to the rate of settlement and the terminal velocity of dust particles, and the application of the physical laws governing deposition. The author has used successfully a method of measurement involving the arrangement of series of gauges in rows extending radially from the suspected source, observations being made with due regard to the prevailing winds. Another method is particularly applicable to the measurement of dust emitted from pulverized coal furnaces, and is based on the tendency of the particles emitted from such furnaces to fuse whilst suspended in the furnace during combustion.
Directional deposit gauges have been tried, but so far have not been very successful. The basic idea is to provide a gauge which will separate the deposits from different directions, and various forms have been experimented with.
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