COAL.
73
Similar experiments with Newcastle cannel showed a yield of 10,000 feet at a high heat,and 9,500 at a moderate heat. The average value of the coal w r as proved to be equal to851 lbs. of sperm from one ton, and the yield 9,833 feet, each cubic foot of which was equalto 600 grains of sperm.
Experiments with Wigan cannel produced at a high heat at the rate of 11,400 feet of gasper ton, and at a moderate heat 10,000 feet, the average yield being 10,850 cubic feet, onefoot of which w-as equal to 465’8 grains of sperm, and the illuminating power of the gasfrom one ton of coals was equal to 718 lbs. of spermaceti.
Boghead cannel, when subjected to similar experiments, exhibited a striking difference inits yield of gas when distilled at a high and at a low heat, as the following Tables willshow :—
BOGHEAD CANNEL.
At a Low Heat.
Time occupied in the Distilla-tion of each Foot.
Feet.
Total Time.
Successive Feet.
min.
sec.
min.
sec.
2
25
1
1
57
1
4
22
2
2
4
1
6
26
3
2
12
1
8
40
4
2
18
1
10
56
5
2
24
1
13
20
6
2
32
1
15
52
7
2
35
1
18
27
8
2
50
1
21
17
9
3
16
1
24
33
10
4
29
1
29
2
11
6
27
0-5
35
29
11-5
6
5
0-132
41
34
11-632
Products.
11,632 feet of gas per ton.
715 lbs. of coke „
720 lbs. of tar „
No ammoniacal liquor.
Each cubic foot of gas, when consumed in a No. 1 London fish-tail burner, was equal to1,275 grains of sperm; hence, 11,632 X 1,275-7-7,000 gives the illuminating power of thegas from one ton of this coal equal to 2,126 lbs. of sperm candles.
L