GASS LIGHTS. ()<$ 



per day, the advantage would be still more in favour of fho gass 

 light; the interest of the capital, and wear and tear of the appa. 

 ratus, continuing nearly the same as in the former cese ; thus, 



1250X3 = 3750 cubic feet of gass per day, which would be 

 produced by lOfcwt. of cannel coals; this multiplied by the num. 

 ber of working days, gires 168 tons per annum, which, valued 

 as before, amounts to . . j. 188 



And 60 tons common coal, for burning under the 

 retorts, will amount to . 30 



218 

 Deduct 105 tons of coak, at 26*. Sd. . 140 



Leaving the expenditure in coal, after deduction of 



the coak, and without allowance for the tar, at 78 

 Adding to which the interest, and wear and tear of apparatus, as 

 before, the total annual cost will not be more than . 650 ; whilst 

 that of tallow, rated as before, will be . 3000. 



It will readily occur, that the greater number of hours the gass 

 is burnt, the greater will be its comparative economy ; although, 

 in extending it beyond three hours, an increase of some parts of 

 the apparatus would be necessary. 



If the economical comparison were made with oils, the advan. 

 tages would be less than with tallow. 



The introduction of this species of light, into the establishment 

 of Messrs. Philips and Lee, has been gradual; beginning in the 

 year 1805, with two rooms of the mill, 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. 



At first some inconvenience was experienced from the smell of 

 the unconsumed, or imperfectly purified gas, which may in a great 

 measure be attributed to the introduction of successive improve- 

 ments in the construction of the apparatus, as the work proceeded. 

 But since its completion, and since the persons to whose care it is 

 confided, hive become familiar with its management, this incon. 

 venience has been obviated, not only in the mill, but also in Mr. 

 Lee's house, which is most brilliantly illuminated with it, to the 

 exclusion of every other species of artificial light. 



T.'ie peculiar softness and clearness of this light, with its almost 



