Coal Ga$« 
Descrihtion of an Afifiaratus for making carburetted Hydrogen 
Gas from Pit CoaU and lighting Manufactories with it . By Mr a 
Samuel Clegg, of Manchester. 23. JVick. Jour. 85. 
Dear Sir, 
When your son was in Manchester, he called to see my ne« 
phew, Samuel Clegg’s improved gas lights, and was desirous to 
have a plan of his method, which my nephew promised him, and 
I undertook to get it conveyed to you, I have accordingly, taken 
the opportunity of sending to the Society of Arts a plan and ex- 
planation of his apparatus. 
He lighted a large manufactory in Yorkshire some years ago 
upon this principle, and has since lighted some buildings in this 
neighbourhood, and I believe he is the first person, who succeeded 
in rendering these lights free from the offensive smell which gene-* 
rally accompanies them. My nephew served an apprenticeship to 
Messrs. Boulton and Watt, of Birmingham, in the steam engine 
business, in which he is now engaged here on his own account^ 
and has made considerable improvements in their construction* 
X remain, dear Sir, 
Your most obedient servant, 
ASHWORTH CLEGG. 
Manchester , May 18, 1808. 
SIR, 
Your esteemed favour I have received, and, according to you® 
request, have sent you a fuller explanation of the gasometer and 
lamp, accompanied with farther drawings. 
A gasometer, containing seven hundred cubical feet of gas, 
weighs about twenty hundred weight, and costs about two pounds 
ten shillings the hundred weight. 
The whole of an apparatus complete, capable of supporting 
forty lamps for four hours, each lamp affording light equal to 
ten candles of eight in the pound, will cost about two hu ndred and 
fifty pounds. Each lamp consumes six cubical feet of gas, per hour* 
I am happy to find, that the Society have honoured my cammu* 
ideations with their attention,, and I remain, with great respect, 
SIR, 
Your most obedient servant, 
S. CLEGG, 
Manchester f Aug . 12, 1808*. 
