242 



CHEMICAL MANURES. 



in F, viz. steam, COo, H.,S, are led by the pipe k into the tubular 

 reheater J, where they transfer their heat to the ammoniacal liquor. 

 The sulphuric acid contained in the vessel F is sufficiently concen- 

 trated for the sulphate of ammonia formed to precipitate completely 

 after saturation. The disengagement of heat accompanying the 

 combination of ammonia with sulphuric acid gives rise to very 

 energetic evaporation, which considerably facilitates the precipitation 

 of the sulphate. Feldmann's stills work very economically and are 

 very much used in Germany. A large-sized still of this type distils 

 4J:,600 gallons of ammoniacal liquor in twenty-four hours. 



Fig. 47. — Gruneberg and Blum's Ammonia Still. 



Gruneberg and Blum's Still. — The liquor first passes into a 

 tubular reheater B through the pipe a ; it then ascends into the 

 column A in E by the -pipe h ; it descends the column from plate 

 to plate to meet the steam ; then it passes through the pipe e into 

 the boiler F, which contains milk of lime, where the combined 

 ammonia is liberated. The liquid which fills the boiler F rises 

 above the level of the pipe /, flows into the mud pocket g, passes 

 out at h, spreads over the gradations of the column i, and runs 

 away by the pipe h and the orifice t. 



