for the Production of Oil Gas. 123 



night in a bed-chamber, it has been found that from 20 to 30 

 cube feet of oil-gas is sufficient ; and, therefore, a gazometer 

 containing 100 feet will give a supply for four nights. 



Such a gazometer will be about 6 feet long and 4 wide, and 

 rather more than 4 feet high. One for 400 cube feet may be 

 10 feet long, and 7 wide, and about 6 high, and larger ones, of 

 course, in proportion. 



There is no occasion that a gazometer should be placed near 

 the other parts of the apparatus, though they are, for the conve- 

 nience of description, so exhibited in the plate ; and, indeed, at 

 Apothecaries' Hall, from which the drawing has been made, the 

 gazometer is not so placed, but is at a distance in the yard, 

 where it was originally fixed and used for coal-gas. No incon- 

 venience arises from the gazometer being apart from the rest, 

 and it allows of placing them out of the main building, either in 

 any yard or out-building that may be at hand. 



Description of the Oil-gas Apparatus. 

 A A (Plate I.) Figure 1, Stoves made of cast iron, and lined 

 with brick-work, containing the retorts. 



a Doors to get at the retort mouths for cleansing them. 

 b Fire door, c Ash-pit, 

 B Iron-stand, or frame, supporting the condenser, oil-cistern, 



and wash vessel, 

 C Oil-cistern, D Cock, to permit the oil to enter the cistern by 

 the funnel E, or, by turning it in another direction, to flow 

 into the retorts by the pipe F, 



d d Small index cocks, to govern the admission of the oil 

 in the retorts. 

 These parts are shown upon a larger scale in Fig, 2. 

 GG Perforated columns, by which the oil descends to the retorts. 

 HH Perforated columns, by which the gas ascends from the re- 

 torts, and is carried by the moveable pipe I, to the conden- 

 ser in the case J. This case is filled with cold water, sur- 

 rounding the condenser. 

 The columns arc fitted with stoppers on their tops, which 

 arc easily taken out for the convenience of cleaning. 



