Sd 
44 Silliman and Wurtz on Air and Gas. 
gas, reaching a total loss of 80 per cent with 15 per cent of air 
added ; while we obtain 57°53 per cent loss with 16 per cent ; 
and 93 per cent loss with 20 per cent air, while with the lat- 
ter volume of air added we get 72°90 per cent loss. These 
differences may be accounted for by the French trials being 
made upon a gas of not more than 12 candles power, our trials 
being made on a gas averaging nearly 15 candles. Also, by the 
fact that in the French experiments the gas was burned from 
a batswing burner, ours from a standard Argand. 
In the experiments of Messrs. Audouin and Bérard, two gas _ 
holders of equal capacity were filled, one with standard gas — 
and the other with the same gas mixed with 1, 2, 3, etc. per 
cent of air. Each fed a burner of the second class, regulated 
to a consumption of 140 litres of gas per hour. e illumi- 
nating power of the two were compared by making that of 
the pure gas equal unity. The results are given in the fol- — 
lowing Table, where each figure gives the mean of 6 or 8 con- 
cordant observations. 
TABLE IT. 
Table showing the results of mixture of air with gas, by Messrs. Audouin and Bérard. 
Common Gas. Gas mingled with Air. 
Intensity.|__Size of Flame. _||°0?25\"” |ratensity.|Intensity.| Size of Flame. 
Height. ; Breadth. || per 100. Loss of | Height. | Breadth. 
mm. mm. mm. mm, 
100 49 92 1 0°94. 6 43 102 
Ws 48 92 2 0-8 11 42 100 
- 49 93 g 0°82 18 42 97 
= 48 94. 4 O74 26 42 94 
ce 46 94 5 0 67 aa 42 96 
bay 45 93 6 0°56 44 41 95 
fs 48 93 4 0°47 53 40 94 
~ 48 93 8 42 58 39 94 
os 46 94 9 036 64 89 93 
<i 47 93 10 0°33 67 38 89 
vie 46 93 15 0°20 80 35 86 
ath 45 92 20 0°07 93 83 86 
_ 45 92 30 0-02 98 26 "9 
ee “ 40 | 0-01 99 21 60 
. = “ 45 0-00 100 18 47 
" vs 5 50 00 100} 12 24 
nation. Unfortunately Messrs. A. and B. do not record the — 
actual illuminating power of their standard gas, which however — 
we are led to believe cannot be more than 12 candles of the | 
English and American standard, 
