Shewing the value of 4-hour charges, over 6-hour charges; and of 9,200 cubic feet over 11,120 cubic feet.
Note.—9500 cubic feet of Wigan cannel coal gas are equal in illuminating power to 859 1-6th lbs. of candles, which at 7s. 6d. per dozen lbs. will cost 25l. 10s. 51⁄2d. It is also found that any burner with superior gas, will consume only about half the quantity it would do with common gas.
4th Experiment, May 30th.—Cannel and Cardiff coal mixed 1⁄2 and 1⁄2, together 112 lbs., produced 460 feet of gas; 2 bushels of coke of good quality; increase of coke over coal in measure about 30 per cent.; loss in weight, 41 lbs.; coke weighed 71 lbs., no breize. Average quantity of gas made from the charge, (4 hours) 4·1 cubic feet, per lb., or 9·200, per ton.
Illuminating power.—At end of first hour.
| Candles. | Cubic feet. | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Distance of candle from shadow | - | 73 or 2·49 | - | Consumed per hour, single jet, 4 inches high | - | 12-10ths | |||
| At end of 2nd hour, do. | 70 or 2·72 | Do.umeddo.er hodo. | 111⁄2-10ths | ||||||
| At end of 3d hour. | This gas very indifferent. | ||||||||
| Average of the three | 70 or 2·72 | Do.umeddo.er hodo. | 111⁄2-10ths | ||||||
Specific gravity 3·44; 5 feet per hour, with a 20-hole argand burner, equal to 14·66 candles.
5th Experiment, May 31st.—Carlisle coal, 112 lbs. produced 410 feet of gas; other products, same as in former experiments with this coal, but heat very low.
Illuminating power and produce of gas.
| 410 ft | - | 1st | hour | 120 | cubic feet | - | Average of this gas: specific gravity, 540; distance of candle from shadow, 55 inches, or 4·4 candles consumed per single jet, 9-10ths of a cubic foot per hour. 20-hole argand burner, 4 feet per hour, equal to 21·33 candles. | ||
| 2nd | 100 | ||||||||
| 3d | 90 | ||||||||
| 4th | 100 |
It is possible, from the superior quality of this gas, that a little of the cannel gas made for a particular purpose, may have have got intermixed with it in the experimental gasholder and apparatus.