UPOIS' SOTHE OF THE PHEHOMEHA OF COMBUSTION, 
641 
Second Series. 
No. of 
Obser- 
vation. 
lUuminating 
power of Experimental Flame compared with Standard Flame at 100. 
Pressure of air in receiver = 
10 2 in. 
mercury 
12-2 in. 
mercury 
14-2 in. 
mercury 
16-2 in. 1 18-2 in. 
mercury mercury 
20*2 in. 
merciu’y 
22*2 in. 
mercury 
24-2 in. 
mercury 
26*2 in. 
mercury 
28-2 in. 
mercury. 
30*2 in. 
mercury. 
1 
4-3 
14-6 
23-6 
35*1 
44*0 
56*8 
72*9 
86*3 
95*6 
108*1 
117*5 
2 
4*2 
14-6 
23-7 
35*1 
44*2 
56*8 
72*9 
86*3 
95*5 
108*1 
117*5 
3 
4-3 
14-6 
23-7 
35*1 
44*2 
56*5 
72*9 
86*3 
95*5 
108*6 
118*4 
4 
4-3 
14*6 
23-6 
34*9 
44-2 
56*8 
72*9 
86*8 
95*4 
108*6 
118*4 
5 
4-2 
15-0 
23-6 
35*1 
44*2 
56*5 
72*6 
86*8 
95*1 
108*1 
118*4 
6 
4-3 
15-0 
23-6 
34*9 
44*2 
56*.5 
72*9 
87*1 
95*5 
109*0 
118*4 
7 
4-2 
15-0 
2.3*7 
35*1 
44*0 
56*8 
72*6 
87*1 
95*7 
109*0 
118*4 
8 
4-3 
15-0 
23*7 
34*9 
44*0 
56*8 
72*9 
87*1 
95*9 
109*5 
118*8 
9 
4-2 
lo-O 
23*7 
34*9 
44*2 
56*8 
73*2 
86*8 
95*8 
109*0 
118*8 
10 
4-3 
15-0 
23*5 
34*7 
44*2 
57*0 
73*2 
86-8 
95*8 
109*5 
119*4 
11 
4*2 
14-9 
23*5 
34*7 
44*2 
57*0 
72*9 
86*8 
95*9 
108*6 
119*4 
12 
4-2 
14-9 
23*6 
34*7 
44*4 
56*8 
72*9 
86*8 
95*9 
108*6 
119*4 
13 
4-3 
15-0 
23*7 
34*9 
44*4 
56*8 
72-9 
87*1 
95*9 
108*1 
119*9 
14 
4-3 
15-0 
23*6 
34*7 
44*6 
57*0 
73*2 
87-1 
96*0 
108*1 
119*9 
15 
4-2 
15-0 
23*7 
34-9 
44*6 
56*8 
72*9 
87*1 
95*9 
108*6 
119*4 
16 
4-2 
15-0 
23*6 
35*1 
44*6 
57*0 
72*2 
86*8 
95*7 
109*0 
119-4 
17 
4-3 
15-0 
23*5 
35*1 
44*6 
56*8 
72*6 
87*1 
95*7 
108*6 
118*8 
18 
4-3 
15*0 
23*5 
34*9 
44*4 
56*8 
72*9 
86*8 
95*9 
108*6 
118*4 
19 
4-3 
14-9 
23-6 
34*9 
44*6 
57*0 
73*2 
86*8 
95*6 
108*1 
118*4 
20 
4-3 
15-0 
23*5 
34*9 
44*6 
56*8 
73*2 
87*1 
95*9 
108*6 
117*5 
Mean 
4-3 
14-9 
23*6 
34*9 
44*4 
56*8 
72*9 
86*8 
95*7 
108*6 
118*8 
In order to bring the two series of observations into more strict comparison with each 
other, and with following determinations, it will be convenient to reduce the mean ex- 
perimental numbers to a standard of illuminating power, in which the light at the max- 
imum pressure, that is the full atmospheric pressure, is assumed to be 100. We then 
get the following numbers : — 
First Series. 
Pressure of air 
in receiver in 
ins. of mercury. 
Mean illumi- 
nating power. 
Experimental. 
Mean illumi- 
nating power. 
Reduced. 
29*9 
119*97 
100*0 
24*9 
90*0 
75*0 
19*9 
63*5 
52*9 
14*6 
24*2 
20*2 
9*6 
6*5 
5*4 
6*6 
1*1 
*9 
