127 
Application of the Gas from Coal. 
the number of working days in the year (313), the annual 
consumption of cannel will be 110 tons, and its cost £ 125. 
About one-third of the above quantity, or say forty tons of 
good common coal, value ten shillings per ton, is required 
for fuel to heat the retorts ; the annual amount of which is 
£20. 
The 110 tons of cannel coal when distilled, produce about 
70 tons of good coak, which is sold upon the spot at is. 4 f. 
per cwt. and will therefore amount annually to the sum of 
£ 93 - 
The quantity of tar produced from each ton of cannel coal 
is from eleven to twelve ale gallons, making a total annual 
produce of about 1250 ale gallons, which not having been 
yet sold, I cannot determine its value ; but whenever it comes 
to be manufactured in large quantities, it cannot be such as 
materially to influence the economical statement, unless indeed 
new applications of it should be discovered. 
The quantity of aqueous fluid which came over in the course 
of the observations which I am now giving an account of, was 
not exactly ascertained, from some springs having got into 
the reservoir ; and as it has not been yet applied to any 
useful purpose, I may omit further notice of it in this state- 
ment. 
The interest of the capital expended in the necessary appa- 
ratus and buildings, together with what is considered as an 
ample allowance for wear and tear, is stated by Mr. Lee at 
about £550. per annum: in which some allowance is made 
for this apparatus being made upon a scale adequate to the 
supply of a still greater quantity of light, than he has occasion 
to make use of. 
