OIL -(J AS AlTAllATUS. -i23 



ly placed in sucli a fire-place as is usually found in 

 back kitchens, and will occupy a space only of about 

 three feet square, or more conveniently of four feet 

 by three, and will require a height of about eight 

 feet*." A large apparatus now in use at Apothe- 

 caries Hall, measures ten feet in breadth, six feet in 

 depth, and about eight feet in height. 



The gasometer for private houses, should scarce- 

 ly be of less capacity than 80 to 100 cubic feet ; and 

 for mansions and larger establishments, 300 to 600 

 cubic feet. The former will only require a gasome- 

 ter of about four feet wide, four feet high, and five 

 or six feet longf . 



The only particular attention requisite with the 

 patent apparatus, seems to be the cleaning out of the 

 retorts, which, from the accumulation of carbonace- 

 ous matter, becomes necessary from time to time, 

 and the keeping up of a moderate fire when the ap- 

 paratus is in use J. 



This carbon is the only residuum in the retort, 

 and the only products of the oil " besides the gas, 

 are a minute quantity of sebacic and acetic acids, 

 and a portion of water," all of which are separated 

 by passing the gas through water ^. 



The advantages of oil-gas, when contrasted with 



* Journal of Literature, &c. vol. viii. p. 122. 

 f Idem, p. 123. X Mem, p. 121. 



§ Idem, vol. vii. p. .31fi. 



