a 
OF COAL AND RATE OF EVAPORATION. 9 
bed or flue being made to communicate with the main flue 
of a factory, to insure the draught being under control. 
Fig. 1. 
VLDL LELELLLLLELLLE A 
ty “4 
y 
Rie 6 30 Scale of feet. 2 3k 
The evaporation from the pan first in order represents the 
direct heating effect of the fire; the evaporation from the 
second may be supposed to represent the heating effect of 
an equal surface of blaze; the evaporation from the third 
and fourth the effect of heated air only. 
With a moderately strong draught the average rate of 
evaporation from the four open pans was as follows: 
From the first pan, 100 .......seseesseeeeuee 67.6 
From the second ,, 27 ......scesceseeeseeee 18.2 
mrekxomtherthirdis, ls) .cueceotuesseercnees 8.8 
From the fourth ,, einpndOsmericbedecadoo: 5.4 
100.0 
Care should be taken to compare in each case the scale 
attached to the drawing. 
VOL. XV. Cc 
