78 



CONSTRUCTION OF RETORTS. 



Fig. 19. 



e is a collar upon the shaft of the screw, working between the bottom of 

 the stuffing-box and a washer held in its place by four pins. The stuffing-box 

 is made tight in the usual way, by screwing the gland/ against a gasket. 



g is a shield loosely attached to the front of the piston, to prevent the accu- 

 mulation of small coal-dust in the mouth of the retort. When the charge is 

 thrust forward, the piston is turned back directly into the mouth, to preserve 

 it from the action of the heat. 



That part of the retort adjacent to the flues only is heated, consequently 

 the only part liable to much wear and tear. 



Estimate of a bench of three Retorts fitted complete. 



Three retorts fitted complete, with mouth-piece, feeder, 



discharging shoot, etc. 

 Brickwork and labour 

 Hydraulic main, stand-pipe, etc. 

 Furnace-doors and grate-bars 



51 



35 



5 



4 



s. 











5 



10 



d. 





 

 

 



95 15 



The only part requiring renewal is that of the retort situated between the 

 outer walls of the bench, and weighing about 9 or 10 cwt. The fuel required 

 to carbonize the coal is about 25 per cent, in coal on the quantity distilled. 



