208 On the Composition and Analysis 



found equal to five wax caudles only, and the consumption of gas 

 per hour amounted to G560 cubical inches. 



With a mixture of six parts by measure of hydrogen with five 

 of olefiant gas, the li(j;ht of the flame was somewhat more intense; 

 and the quantitv of gas consumed by the same burner, so ad- 

 justed as not to smoke, was 6000 cubical inches. 



6. It appears from the above data, that to produce the light 

 of ten wax candles for one hour, there will be required, 



2600 cubical inches of olefiant gas. 

 4875 - - - oil gas 

 13120 - - - coal gas ; 

 and that the quantity of oxygen consumed 



by the olefiant gas will be = 7800 cubical inches, 

 by the oil gas - =11578. 



by the coal gas - =21516. 



Olefiant gas cannot of course be employed for any economical 

 purposes, and is only here adverted to for the sake of compari- 

 son. The relation of the quantity of oil gas to that of coal gas, 

 furnishes a datum that may be practically useful, especially as 

 indicating the relative sizes of gasometers required for the sup- 

 ply of establishments. It may, I think, be stated with sufficient 

 accuracy for practical purposes, that a gasometer containing 

 1000 cubical feet of oil gas, is adequate to furnish the same quan- 

 tity of light as one of 3000 cubical feet of coal gas, provided due 

 attention be paid to the construction of the burners, and to tlje 

 distribution of the lights. 



7. Fqj- the ordinary purposes of illumination by oil gas, I con- 

 sider ten-hole Argand burners, each consuming about a cubical 

 foot and a half per hour, and giving the light of seven wax 

 candles, or nearly two oil Argands, as the most economical and 

 generally u'^eful. Single jet burners, or those in which the flames 

 do not coalesce, consume, as has been above shown, a very much 

 larger quantity of gas for the production of an equal quantity of 

 light ; and for the same reason, Argand burners, in which the 

 flames do not coalesce, consume more gas for an equal produc- 

 tion of light, than those in which the apertures are more nume- 

 rous, but sufficiently near each other to allow of the union of the 

 separate flames. 



8. To ascertain the relative heating powers of the flames of 

 olefiant oil, and coal gases, I employed the twelve-hole Argand 

 burners mentioned above, and placed over each, as near to the 

 lamp glass as was consistent with a clear flame, a clean copper 

 boiler, 2,5 inches deep and 5 inches diameter, slightly concave 

 at bottom, capable of holding rather more than a quart of water, 

 with an immersed thermometer, and a small vent for steam. It 

 contained two pounds of distilled water, which was raised to the 



boiling 



