On the Application of the Gasjrom Coal. 117 



the number of working clays, gives 168 tons per annum, 

 which, valued as before, amounts to - 188/. 



Ana 60 tons common coal for burning under 

 the retorts, will amount to 30 



218 

 Deduct 105 tons of coak at 26i. 8d. - 140 



Leaving the expenditure in coal, after deduc- 

 tion of the coak, and without allowance for 

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



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

 gas is burnt, the greater will be its comparative ceconomy ; 

 although in extending it beyond three hours, an increase of 

 some parts of the apparatus would be necessary. 



If the ceconomical comparison were made with oils, the 

 advantages would be less than with tallow. 



The introduction of this species of light into the establish- 

 ment of Messrs. Philips and Lee, has been gradual ; be- 

 ginning 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 improvements in the construction of the appa- 

 ratus, as the work proceeded. But since its completion, 

 and since the persons to whose care it is confided have be- 

 come 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 with it, to the 

 exclusion of every other species of artificial light. 



The peculiar softness and clearness of this light, with its 

 almost unvarying intensity, have brought it into great fa- 

 vour with the work people. And its being free from the 



H 3 incon- 



