A GAS LIGHTS, 119 
TABLE Nes 
Shewing the relative proportions of Gas, Tar, and Coak, produced ty the Distillation of Coal, and the 
ees illuminating power of the Gas compared with Candles. 
“*O - Pou A ; ed No. of yea 
0 r 6 in the 
Capacity B Measure in ed Cubic feet Coak . . veer 
eter by of the n eonsumed to) “op Gas ak in Tar, * | Ammonia- |Ib. to give an 
Gas in |Bushels and Pecks.| distil off | | ditto, leal Liquor. equal li 
ts fhe Sazometer,| "Pounds, the Gas, | Purified. 7 eae ae! 
piece.’ Bushels. | Pecks. Gas. 
Litany 12 295 100 v + 34 320 64 5.4 7.85 96 
ly wed 390 200 2 12 69 640 128 10.8 15.7 192 
VB 485 800 8 23 102 960 192 16.2 23.55 288 
4 780 400 4 St 136 1280 256 21.6 | 31.40 384 
5 1075 500 6 rt) 170 1600 320 27.0 | 39.25 480 
6 1870 600 7 # 204 1920 384 32.4 47.10 576 
7 1665 700 8 1} 238 2240 448 37.8 54.95 672 
8 1960 800 gfe 2 272 | 2560 512 43.2 | 62.80 768 
9 2255 900 10 35 806 2880 576 48.6 70.65 864 
10 2550 1000 12 _ 340 3200 640 54.0 | 78.50 960 
11 2845 1100 13 $ 374 3520 704 59.4 86.35 1056 
12 3140 1200 14 13 408 8840 768 64.8 94.20 1152 
18 $435 1300 15 2% 442 4160 832 70.2 | 102.05 1248 
14 3730 1400 16 3 476 4480 896 75.6 | 109.90 1344 
15 4025 1500 18 _ 510 4800 960 81.0 | 117.75 1440 
16 4320 1600 19 $ 544 5120 1024 86.4 | 125.60 1536 
17 4615 1700 20 13 578 $440 1088 91.8 | 183.45 1632 
¢ 18 4910 1800 21 ax 612 5760 1152 97.2 | 141.30 | 1728 
a & + aq - 5205 1900 22 3 646 6080 1216 102.6 | 149.15 1824 
20 5500 2000 24: _— 680 6400 1270 108.0 | 157.00 1920 
2). 5795 2100 25 4 714 6720 1334 113.4 | 164.85 2016 
22 6090 2200 26 1} 748 7040 1398 118.8 | 172.70 2112 
23 6295 2300 2T 2 782 7360 1462 124.2 | 180.55 2208 
D4 6390 2400 28 32 816 7680 1526 129.6 | 188.40 2304 
25 6885 2500 30 —_ 850 8000 1590 185.0 | 196.25 2400 
26 7180. 2600 31 4 884 8300 1654 140.4 | 104,10 2496 
27 TATS 2700 32 1} 918 8640 1718 145.8 } 111.85 2592 
28 “T7T0 2800 33 22 952 8960 1782 151.2 | 119.70 2688 
29 8065 2900 34 3} 986 9280 1846 156.6 | 197.55 2784 
80 8360 3000 36 — 1020 9600 1910 162.0 | 135.40 2880 
given quantity in cubic feet is burned in a given time. 
If it were required to find the number of candles of © 
any other size, or a different number in the pound, 
multiply the number of candles in the Table by the 
iven number in the pound, and divide the product by 
the number in the’ pound of those in the Table ; the 
t will be the number os ee For example, 
‘number of candles equal to the gas from 800 Ib. of 
coal, which is 2560 cubic feet, is 768, what will be the 
number of candles of 5 to the pound? 5 x 768=3840 ; 
then, 3840--6=640, the number of candles required, 
From this Table it may be seen how much coal is 
equal to a given weight of tallow. If the number of 
eandles in the last pte be divided by 6, the quotient 
pag ome ey cr en in pounds to the coal in 
the third column. For instance, the candles equal to 
We have seen, by the data already given, that half a 
cubic foot of gas will be consumed in the same time, 
giving the same light as 175 grains of tallow froma 
candle 6 to the pound. We therefore should say, that 
when a-cubic foot of air is burnt in two hours, its light 
will be equal to that of a mould candle of 6 to the 
pound ; but if the same gas were burned in one hour, 
either from doubling its velocity or its aperture, then 
it would require two such candles to produce an equal 
light in all respects. Ifthe candles to give an equal 
light with as when burnt in one hour be 
divided by the time, it will give the candles for that 
time. To find the quantity of candles of any other 
size, use the rule above given. 
Before we conclude this article, we think it right to 
Practical 
800lb, of coal are 768; the last divided by 6 gives aay 
128Ib. of tallow, Nee to 800Ib. of coal, which is Ib. give a few useful rules to those who may have the ma‘ fo 
of tallow to 6.25 of coal. nagement of the gas light apparatus. ‘These are the nagement 
~ Gas light may be compared with candles in another 
point of view. ae is, what ap aoe of candles of a 
given size give a light equal to that produced by the 
es wars bo vuceied unthg ts given ; that is, when a 
substance of the rules drawn up by Mr Clegg for the of the appa- 
use of the workmen. 
Ist, Before closing the retort, take common clay, 
dried, pulverised, and sifted, to which add as much 
* This fluid on distillation affords about one-fourthcits weight of a thin light inflammable fluid resembling naphtha, leaving a resi- 
daum like pitch or asphaltum, 
ratus- 
