OO —————— 
——- 
OF COAL AND RATE OF EVAPORATION, ll 
The fire-place under the first boiler was two feet wide 
by three deep. 
The fire-bars were half an inch thick, with half inch 
spaces. 
The distance of the fire-bars from the bottom of the 
boiler was nine and a half inches. 
The distance of the flame-bed from the bottom and sides 
of the second and third boilers was four inches. 
The boiler plate was of quarter inch iron. 
The comparative evaporating power of the three boilers 
so placed, was found to be as follows : 
Table A. 
Numb Pete Ade? 
umber Durati Cc ive E tion, eated from - 
Extrie |p, of ng [Copsitea,| the Evaporation fromthe hist jad evaporate 
ments 7xperiment. Boiler being 100, Boilers by one 
pound of Coal. 
1 we Bay Lbs. 1st Boiler, |2nd Boiler. 3rd Boiler. Lbs, 
2 6 30 420 100 22.8 13.8 5.26 
3 10*-55 8il 100 27.8 i 15.1 | 5.19 
4 6 30 694 100 39.4 = 20:3°* 4.68 
5 12 hs wi 0) 480 100 33.5 16.4 3.98 
6 6 50 500 100 32.9 12.8 - 4.42 
YF 82 15 473 100 29.0 12.0 * 4.87 
8 9 25 47334 100 28.6 9.7 3.83 
9 tes 4894 100 37.0 16.0 4.63 
10 7 00 484 100 36.0 13.0 4.02 
11 5 925 486 100 50.7 24.0 4.64 
12 Y 45 487 100 4A. 22.9 4.59 
11; 838 00 5798 1.100 382.1 176.0 50.11 
Average 7) 23 527 | 100 34.7 | 16.0 4.55 
Evaporation from the first boiler, 100.0 ......... 66.4 
ss from the second ,, Sh —scaccones 23.0 
- from the third _,, EGO} Hae. s de 19.6 
100.0 
The ultimate result for the three boilers together, calcu. 
lating the evaporation from 212°, is 5.31 Tbs. of water eva- 
porated from 212° by one pound of Worsley coal. 
* A preliminary experiment omitted. 
