+-----+-------------+---------------+--------+---------+------------+
| | | Consumed |Specific|Distance |Illuminating|
|Hour.|Gas produced.| per hour |gravity.|of candle|power equal |
| | |per single jet,| |from | to mould |
| | | 4 inches high.| |shadow. | candles. |
+-----+-------------+---------------+--------+---------+------------+
| |_cubic feet._| _cubic feet._ | | _in-_ | |
| | | | | _ches._ | |
| | { | 11-1/2-10ths.}| | | |
|1st. | 150 { | 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 92-1/3 or 2 feet 9 inches. | |
+-----+-------------+----------------------------------+------------+
Average of the above gas, 6-hour charge.
92-1/3 16-10ths. ·359 81 2·03
nearly
Average of the above gas at 4-hour charge.
115 12-1/3-10ths. ·421 75 2·36
Production of gas in 6 hours 556 feet, or at the rate of 11,120 cubic
feet per ton.
Ditto in 4 hours 460 feet, or at the rate of 9,200 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 8_l._ 6_s._ 4-1/2_d._, whilst
324-5/6 lbs. of do. do. at 7_s._ 6_d._ per do.
do. 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.
_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} {Consumed per hour, single}
from shadow } 73 or 2·49 {jet, 4 inches high } 12-10ths
At end of 2nd hour, 70 or 2·72 Do. do. do. 11-1/2-10ths
do.
At end of 3d hour. This gas very indifferent.