3rd Experiment, May 29th

—Car lisle coal (Blenkinsopp). 112 lbs. produced 556 cubic feet of gas. Other products, lo of weight, ., same proportion as foregoing experiment. Average quantity of gas made from the charge (6 hours) 4·96 cubic feet per lb., or 11,120 per ton. In this experiment the quantity of gas generated every hour was ascertained; the illuminating power, the specific gravity, and the quantity of gas consumed by the single jet with a flame 4 inches high, was tried at the end of each hour, with the respective gases generated at each hour; and the following is a table of results. RESULTS. | Hour. | Gas produced. | Consumed per hour per single jet, 4 inches high. | Specific gravity. | Distance of candle from shadow. | Illuminating power equal to mould candles. | | cubic feet. | cubic feet. | | inches. | | | 1st. | 150 | - | | | 111⁄2-10ths. or 1·15 | | - | ·534 | 70 | 2·72 | | 2nd. | 120 | | 11 | | ·495 | 75 | 2·36 | | 3rd. | 95 | | 12 | | ·344 | 75 | 2·36 | | 4th. | 95 | | 15 | | ·311 | 80 | 2·08 | | 5th. | 80 | | 17 | | ·270 | 85 | 1·81 | | 6th. | 16 | | 29 | | ·200 | 100 | not one | | Total | 556 | or | 921⁄3 or 2 feet 9 inches. | | Average of the above gas, 6-hour charge. | | 921⁄3 | | 16-10ths. nearly | ·359 | 81 | 2·03 | | Average of the above gas at 4-hour charge. | | 115 | | 121⁄3-10ths. | ·421 | 75 | 2·36 | Production of gas in 6 hours 556 feet, or at the rate of 11,120 cubic feet per ton. Produc Ditto f gas in 4 hours 460 feet, or at the rate of 1 9,200 cubic ditto. The relative value of these productions of gas is as follows, viz.: 11,120 at 16-10ths per hour nearly, (or 1·5916 accurately) and equal to 203 candles; the 11,120 feet would be equal to and last as long as 1597 candles, or 266 1 ⁄ 6 lbs. of candles. 9200 at 12 1 ⁄ 3 -10ths. per hour, (or 1·2375 accurately,) and equal to 236 candles; the 9200 feet would be equal to 1949 candles, or 324 5 ⁄ 6 lbs. candles. Now 266 1 ⁄ 6 lbs. of mould candles, at 7 s. 6 d. per dozen lbs. will cost 1 8 l. 6 s. 4 1 ⁄ 2 d. , whilst Now 324 5 ⁄ 6 lbs. of m do. d ca do. es, at 7 s. 6 d. per doze do. bs. w do. ost 10 l. 3 s. 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 7 s. 6 d. per dozen lbs. will cost 25 l. 10 s. 5 1 ⁄ 2 d. It is also found that any burner with superior gas, will consume only about half the quantity it would do with common gas.