100 The Phosphates of America. 



corrosive action, for the rapid decomposition of the fire-bricks 

 generally used for the base of the interior lining. Having con- 

 tinued his experiment up to recent times, the same distinguished 

 author has published further and still more elaborate analyses, 

 entirely confirmatory of his first discovery, and, as incontro- 

 vertible evidence, proves that the addition to a sulphuric-acid 

 plant of a Glover tower, invariably results in an augmentation 

 of production amounting, according to its dimensions and the 

 excellence of its construction, to from ten to twenty per cent., with 

 r no increase in the material employed. 



His operations were conducted in his own works, at Thann, 

 with shelf -burners, consuming 5-J tons of pyrites " fines " aver- 

 aging forty-eight per cent, sulphur daily. The whole of the 

 acid produced in the chambers was passed through the Glover 

 tower, where an evaporation of no less than 3|- tons of water was 

 noted in every twenty-four hours. Starting with an accurate 

 knowledge of the quantities contained in the chamber, tanks and 

 various apparatus, the total daily production was accurately re- 

 corded during a period of sixteen days, at the end of which mat- 

 ters were so arranged as to be exactly in the same position as they 

 were at the commencement of the experiment. 



Of the 96 tons of 66 B. acid obtained, 15.152 tons, or 15.70 

 per cent., must have been formed in the tower. A second experi- 

 ment, by what may be termed an indirect method, confirmed this 

 result. 



In this case the exact quantity of sulphuric acid condensed in 

 the leaden chambers was accurately determined, with an absolute 

 previous knowledge of what should be theoretically yielded from 

 the amount of pyrites burned. The difference between this quan- 

 tity, and that actually obtained, represented the excess formed or 

 condensed in the Glover tower. Thus: 



Tons. 



Sulphuric acid of 66 B. produced 48.300 



Sulphuric acid of 66 B. condensed in the chamber 40.378 



Difference representing the acid formed in the Glover tower . 7 . 922 

 Or 16 . 30 per cent 



To these figures must be added the sulphuric acid which, pass- 

 ing with the gases through the tower in a state of vapor, was con- 

 densed in the connection-pipe. This being daily and exactly 



