Even now coal cannot compete with gas in the manufacture of window
glass, for, the gas being free from sulphur and other impurities
contained in coal, produces a superior quality of glass; so that in this
branch of industry the question of superiority seems already settled.
Having said thus much of an industry now in its infancy but promising
great growth, I submit tables of analyses of common and of the natural
or marsh gas, the latter from a paper recently prepared by a committee
of the Engineers' Society of Western Pennsylvania, and for the use of
which I am indebted to that association:
COMMON GAS.
Hydrogen 46.0
Light carbureted hydrogen (marsh gas) 39.5
Condensible hydrocarbon 3.8
Carbonic oxide 7.5
" acid 0.6
Aqueous vapor 2.0
Oxygen 0.1
Nitrogen 0.5
-----
100.0
Natural gas is now conveyed to Pittsburg through four lines of 5-5/8
inch pipe and one line of eight inch pipe.
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