Laght and the volume of Gas consumed 21 
No. 1 “eee burner consuming : a feet per. hour, mixed gas= ar By 9 candles 
: “a “ : - “ “ its rid by “a 
Here No, 1 ¢ igchnes very nearly the true illuminating power 
of the gas, and may be assumed as a fair criterion of the law 
under consideration. 
By Farmers Theorem, 
No. : becomes 3.24? : 18°95 = 5? ; 45°12 candles. 
3°487 ; 20°94 = 5? : 43°22 3s 
By direct ratio (old rule). 
No. : becomes 8°24; 18°95 = 5: 29°24 candles, 
3°48 : 20°94 = 5: 30°09 
By this it appears be by the old rule, assuming the true 
candle power ot the gas to be 42°79 candles, the two observa- 
tions Nos. 2 and 3 are in error by about 30 per cent, while by 
Farmer’s theorem the error is reduced to 3 per ‘cent, the 
former being too small and the latter too large. 
Albert Gas —The well known Albertite of New Brunswick 
furnishes a gas of remarkable richness. Its true candle power 
can be measured only by diluting largely with street gas of 
known value, and calculating it from the determined intensity 
of the mixture. In this way the gas from Albertite is shown to 
have an intensity equal to 70°38 candles, The following rovults 
were obtained by consuming different volumes in the burners 
named. 
No. 1 argand burner consuming z. a feet = = oe 38 ce 
39 : * 
a Scotch tip’ _ e # — = 35 2 
By Farmer's Theorem. ie: age 
No. 2 becomes 2°52 : 16°39 = 52: 65°56 candles 
3 . 2 2 25°25 = §* : J014 22" Sis 
By simple ratio. Set ge 
No. ; becomes 2°5 : 16°39——5: 32°78 candles. se eo me 
3 :25°25=5:4208 “ 4 
The ition from the assumed standard of 70°38 candles 
are as follo 
By the old ae No. 2 falls short 37°6 candlés or 8: pr. ct. 
3 * Farmer’s theorem, 2 ee 7] 4 eas a 
the old rule, No. 3 E Be he wae 
“ Farmer’s theorem, 
It will be observed that No. 2 in this series represents a 
consumption considerably below the minimum which in most 
cases experiment has shown to be the limit of the proposed 
