pg APPLICATION OF THE GAS FROM COAL. 



Iie-:f is conti- tear of the apparatus continuing nearly the same as in the 

 nued longer. « , i 



" former case; thus, 



1250 X 3 — 3750 cubic feet of gas per day, which would 



be produced by 10|^cvvt. of cannel coals; this, multiplied by 



the number of working days, gives l68 tons per annum, 



which, valued as before, amounts to ^188 



And 6o tons common coal for burning under 



the retorts will amount to 30 



218 

 Deduct 105 tons of coak at 26s. Sd. 140 



Leaving the expenditure in coal, after de- 

 duction of the coak, and without allow- 

 ance fur the tar, at 78 



Adding to which the interest and wear and tear of appara- 

 tus, as before, the total annual cost will not be more than 

 ^650, while that of tallow, rated as before, will be .£3000. 

 ^ut an increas- It will readily occur, that tlije greater number of hours the 



ed expense o -^ ^ji^irnt, the greater will be its comparative economy ^ 



apparatus re- & . . . 



quired. although in extending it beyond three hours, an increase of 



some parts of the apparatus would be necessary. 

 Advantage If the economical comparison were made with oils, the ad- 



a ove 01 ess. yau^ages would be less than with tallow. 

 Beginning of The introduction of this species of light into the establish- 

 *^e !^^^"" ment of Messrs. Philips and Lee has been gradual; begin- 

 ning in the year 1805, with two rooms of the millf the 

 counting-houses, and Mr. Lee's dwelling-house. After 

 which, it was extended through the whole manufactory, as 

 expeditiously as the apparatus could be prepared. 

 Inconvenience At first, some inconvenience was experienced from the 

 ^l n ™ smell of the unconsumed, or imperfectly purified gas, which 

 may in a great measure be attriTjuted to the introduction of 

 successive improvements in the construction of the appara- 

 tus, as the work proceeded. But since its completion, and 

 since the persons, to whose care it is confided, have become 

 familiar with its management, this inconvenience has been 

 obviated ; not only in the mill, but also in Mr. Lee's house, 

 which is most brilliantly illuminated v/ith it, to the exclu- 

 siou of every other species of artificial lights 



Th« 



