112

GAS-LIGHT.

Attention to, the preceding tabular statement of experiments is important, as exhihing several very important facts, particularly interesting at this moment to the scienof gas-lighting, and now for the first time made public. ,y

It will not fail to be observed by these experiments that all the coals produced nearequal quantities of gas, notwithstanding the variable characters and qualities of ^coal. The greatest quantity produced being at the rate of 11-648 cubic feet P er . t< ? n ,j ie20 cwt., the smallest 11-200 cubic feet. All these experiments were performed c _greatest care, and under precisely similar circumstances as to pressure, manufacture,

&c. The time in which the quantity of gas is produced from the several coals varies csiderably, and deserves notice, as it most materially affects the economy of P r °. (iuct oU t—that coal being the most valuable, all other things being alike, which yields or g‘J es ^ eits gas in the shortest time; and particular attention is claimed to this fact. Formore ready reference to the table the columns are numbered. No. 11 exhibit 3difference, and it will also be seen by this column that the time varies as theof the coal, the best coal yielding its gas in two hours, and the worst in three b ° ur ®‘ er j.

Another most important, material, and interesting fact is established by these exP^ ements—that the flow of gas is as its density —demonstrated by the variation J “ aseSheights of the flames, as shown in column No. 1, being 18 inches in the inferior » eSto 22 inches in the superior ; while the quantity of gas required to supply these « ^

is in the inverse ratio of their heights, the longer flame requiring but twelve cu . C p ee t,to maintain it, when the shorter flame, from the inferior gas, required sixteen cubicSee column No. 2. . j s ,

Remarkable as this difference in the heights of the flames and the consuBiP 41 ®it is not so great as the difference caused by the quality or illuminating power 0several gases, shown by columns Nos. 5 and 6; where it will be seen that the cons totion of the best gas per hour was only JL of a cubic foot, and its light was eq ,

I V , , 1 Z Q

3 candles, while that of the worst gas was ^ of-a cubic foot, and its l>S nlonly to 1-75 candles, or nearly, the best to the worst, as 1 to 3. ... mjna'

The next column, No. 7, exhibits similar results as to the superior value or a ^eting power of one gas over another. In this case an argand burner visa use ■ jj-edbest gas required only two feet to be equal to twelve candles, while the inferior r qfive feet to be equal to the same. j th e

And in column No. 8, in which another and superior argand burner was us .jJ {tiebest gas required only three feet to be equal to twenty-five mould candles, W j 0 f

inferior required seven and a half feet: from this it results that the 7J cubic . t0

inferior gas, to be equal to the 3 feet of good gas, should have given light ^jjes;sixty-two and a half candles, whereas they only gave light equal to twenly-fi ve cso great is the difference in the qualities of gas for producing light. 3 oV el

While on the subject of the illuminating power and the value of one g a ] S oanother, it will not fail to be observed, by the table, that another great dl s1ncol<exists, caused by the use of particular burners ; as, for example, the best g as ■ 0 t to beNo. 5, where the single jet was used, required seven tenths of a cublC on.hol e a . r "equal to three candles, while the same gas in column No. 7, where a / . an d ingand burner was used, required only two feet to be equal to twelve candles r c-column No. 8, where a 30-hole argand burner was used, only three tee at sn aquired to be equal to twenty-five candles; demonstrating the fact that a byextraordinary ipiprovement in the quantity of illuminating power is ^ jn on.simple increase or enlargement of the burner, affording, where great jn f aCposition is required, a most extraordinary economy in the use of gas, S nted by F" r 'practically by the recent introduction of the celebrated “ Bude” light, pateGoldsworthy Gurney .

Tabular Statement, deduced from the foregoing experiments, r( j bems

eandles to produce as much light as 9,000 cubic feet of gas would al o .^^es ions?product of one ton of coal. (The candles are moulds, 6 to the P°nno> nounm

_.1 . v-t • i a v . i «-vt i y. . . C .Jiao 7 reft. *

cost

of

experiments, J^beih? tbC

and each candle is calculated to burn 9J hours.7s. 6 d. per dozen pounds.)

Cost of candles 7 \i. P er

Candles would cost, to beequivalent to

Where a singlejet burner isused.

1 -

Where a 20-holeargand burneris used.

Where a 30-holeargand burneris used.

Common coal gas

Good do.

£ s. d.

10 18 6

25 18 4

£ s . d.

15 15 8

39 9 6

£' s. d.

21 IS 0

54 16 7

Where .burner to,