PROPERTIES OV OIL-GAS. 425 



" The oil-gas containing no unmixed hydrogen, 

 (which occasions the great heat of coal-gas,) there is 

 no greater heat in proportion from the iiame of oil- 

 gas, than from burning oil in lamps, wax-candles," &c. 



" The apparatus for the production of oil-gas, is 

 much less expensive than that necessary to make 

 coal-gas ; it occupies much less space, — it requires 

 much less labour and skill to manage it, — it is not 

 so liable to wear and tear, and not so costly to repair 

 as a coal-gas apparatus. There are no oifensive pro- 

 ducts to remove ; and on its present improved con- 

 struction, it may be introduced into any dwelling- 

 house without nuisance*." 



" The oil-gas lias a material advantage over coal- 

 gas, from its peculiar richness in olefiant gas, which 

 renders so small a volume necessary, that one cube 

 foot of oil-gas will be found to go as far as four (two?) 

 of coal-gas f." Because, as oil- gas requires more oxy- 

 gen for its consumption than coal, a less quantity of 

 the former is consumed in a flame of equal size, while 

 the brilliancy of the light is superior |. This cir- 

 cumstance produces a great saving of room and of 

 expence. 



" The superiority of the light from oil-gas over 

 other artificial lights, is fully shown by its render- 

 ing the delicate shades of yellow and green nearly 

 as distinct as when viewed by solar light ^"." 



* Quarterly Journal, vol. vii. p. 314. 



+ Idem, p. 315. ;{: Idem, No. xi. 



§ Idem, p. "\6. 



