13 



Nevertheless, after a proper adjustment it worked with perfect satisfac- 

 tion. In all not more than half a day's delay was caused by the ad- 

 justment of this apparatus. 



THE CARBONATATION TANKS. 



These tanks were built by the Pusey and Jones Company, according 

 to the drawings and specifications in Bulletin No. 8, and gave perfect 

 satisfaction. I can suggest no improvement in them unless it be the 

 insertion of revolving paddles to keep down the foam. 



THE FILTER-PRESSES. 



These, four in number, and of thirty chambers each, were constructed 

 by the Pusey and Jones Company, on the general plan of the Kroog 

 filter-press, but with certain modifications suggested and patented by 

 Mr. Sweuson. Their work gave perfect satisfaction. The only fault 

 discovered in them was the weakness of the plates, a great number of 

 them breaking under the ordinary pressure. 



THE SULPHUR APPARATUS. 



This apparatus consists of an air-compressor, two sulphur furnaces, 

 three sulphuring-tanks, and three Kroog's twin filter-presses. The 

 whole apparatus was built by the Sangerhauser Maschinenfabrik, and 

 its work gave entire satisfaction. The apparatus is described in detail 

 in Bulletin No. 8. 



The whole of the machinery, with the unimportant changes noted, 

 was constructed according to the drawings and specifications printed in 

 Bulletin No. 8. Their reproduction is not considered necessary here. 



ANALYTICAL DATA. 



The analyses of canes, chips, waste- waters, purified juices, &c., were 

 made at the factory chiefly by Dr. C. A. Crampton, assisted by Mr. N. 

 J. Fake. The limestones, masse-cuites, press-cakes, &c., were exam- 

 ined in the laboratory at Washington. 



The analyses of the gases from the lime-kiln were made by Mr. G. L. 

 Spencer. 



