. Journal . s to make in rhi- pipe - ;>t the topof the purt inside the egg a hole ol about 3 mm. At thesame time as tin acid is forced through tins pipe, acontinual jet of ;iir is introduced, which in rising formsair cushions, ii- in the air-lift pump or mammoth pumpil I ■ • 111 ■. the principle of which bed and applied by Charles Laurent in 1888 (Bull. Soc. dEncouragement,Nov. is, 1885),twelve ■■ itent By making the hole i larger or smaller, the admission ofiir, and consequently the weight of the column of liquid inthe pipe, inn he increased r diminished. In the arrange-ment shown by Fig.


. Journal . s to make in rhi- pipe - ;>t the topof the purt inside the egg a hole ol about 3 mm. At thesame time as tin acid is forced through tins pipe, acontinual jet of ;iir is introduced, which in rising formsair cushions, ii- in the air-lift pump or mammoth pumpil I ■ • 111 ■. the principle of which bed and applied by Charles Laurent in 1888 (Bull. Soc. dEncouragement,Nov. is, 1885),twelve ■■ itent By making the hole i larger or smaller, the admission ofiir, and consequently the weight of the column of liquid inthe pipe, inn he increased r diminished. In the arrange-ment shown by Fig. i. however, this n gulation ran onlj bemade once for all; in the arrangement indicated by Fig. Jii i an be made as desired, In tins case the air is admittedthrough mi external pipe d provided with a cock r, andcommunicating at one end «ith the chambi r of the acid egg,and at the other with the pipecj bymeans of the cock rthe quantity of air can i» regulated according to thepressure desired. IT,... Fig. 8. if pipe- of - ins. are alreadv in existence, the} i I, Inn the res ill will he less satisfnetorv. it i-bettei to use pipes ol i ins. diameter ami to put upseveral of them. Mi Fraipont, i Vieille Mowho us ieid to tin uses pipes ol I in anil placi - - of ilii-ni side by side. \initial point ol gnat importance is the positi the pipe ; it should be 11 rtical as far as possible, for in an inelii i air has a strong tendency to follow thi- upper wall, so that the pistons in •i • 111. Ill pipe. Raising of .Viiiic Arid. — In most I m tun ntal sulphuric acid plant - il instead of nun Without: into the comparative two systems, the trouble ol niunnthe u it lit - to ihe lop ot Hi. Il- the lithi lUtiuental progress n Ii aim •!. Ior the raising ol I, an an tomatii acid elevator ol stoneware baaIn . n constructed, which works suttoi ili in many industries. Hut Iiccimilnclid it (or raising tin, er. on account •length ot tin deliver} pipe- liipiireilin most


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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882