at, ee ee eee a ee ea a ia rah ae oe ci 
See 
corr Bene 
Silliman and Wurtz on Air and Gas. 43 
— per cent of the total illuminating power remains; and 
— Sake 30 per cent and 40 per cent air, it totally dis- 
ap 
ce “during December and January the hydro-carbon gas 
made at Fair Haven had often as much as 12 per cent of air 
in it ; during the month of February the air by analysis aver- 
aan nearly 9 per cent ; while in March after the separation of 
e pump from the exhaustion apparatus, the air was reduced 
z times to nearly nothing. By column 3 of the Table it will 
be observed that the air found by analysis in the street gas 
at the Highteenth-Street Station of the Manhattan Gas Light 
Campany, New York, averaged nearly 2 per. cent, and the 
New Haven City Gas contained about the same quantity. We 
allow, therefore, this quantity (2 per cent) as a normal amount 
of air in street gas ; and consequently in the Journal of the 
daily operations with the hydro-carbon process at Fair Haven,* 
these corrections have been applied ; giving in two columns 
the ‘corrected candle power,” by the addition of the ratio de- 
give the contaminating air as gas, and lee the correction 
thus obtained the apparent yield is too 
In large gas-works the liability to ateeatondice by air ac- 
cidentally introduced from various causes, diminishes in pro- 
portion to the total make of gas, and an amount of air which, 
when diffused in a very large volume of gas, becomes insigni- 
fone if confined to ten or fifteen thousand feet daily product, 
will become a most serious injury to its illuminating power. 
almost 
entirely by gas engineers ; but in all small gas-works it de- 
serves special attention, and we have no doubt that the low 
illuminating power too often obtained in such works is largely 
due to this cause 
Results of Messrs, Audouin and Bérard—We “< al- 
B. 
_ ready alluded to these results obtained by Messrs, A. 
_ which form part of an important memoir published in "1860, 
_ under authority of the French Government ‘upon the various 
_ burners employed in gas lighting and researches on the best 
S Goliditiond te 
_ append for the sake of comparison, shows “a considerably 
_ higher ratio of loss than we have obtained, being rather more 
_ than six per cent loss for each one cent of air added to the 
or the combustion of gas.’ Their table, which we 
* The Hydro-carbon Gas Proc Re working results on a large scale 
jamin 
port 
under the Gwynn-Harris Patents, N N ov., 1868, Ps May, 1869, by Benj 
MA _N. 
Re 
, M.D., and Henry Wurtz, Y. 8vo, 126, rinted for private 
distributio n = 7 
