Claiificatioii of the Public Watcy Supply of Cinciiniaii. 33 



Dissolved in the least amount of water. Slightly Acid — hot. 

 I. 18.7 (r. of Copperas, Est.' cost in lbs. $.140 



2. Added 1.5 

 3- " '-3 



Sul. Acid, 66 B. 

 Pot. Chlorate^ 



18. 7 X -6= II. 2 lbs. Fe, () 5 SO^ " 



.025 

 •195 



I II). " " " " .032 



There were 15 c.c. of the Solution, Sp. G. 1.64 



100 Drops=2.5c. c. r Drop=: 025 c.c. 



■°i\5* Xi i.2=Solid Salt in i Drop—. 0187, or i Drop in a Diter 

 is 18.7 lbs in 1,000,000 lbs. of water. 



Series 18. Hydrant Water. March 26, 1885. Highly col- 

 ored from Broken Pipes. 



Precipitant Sub-sulphate of Iron Sol. Sp. G. 1.64. 



I Drop=o.o4i G., and contains 0.0187 of Fe^ O5 SO4. 



Effect of Clarification- on the Sewage. 

 Supplementary table to Series 18. 



I. These estimates are from Figures given me by manufacturers, for large quan- 

 tities. 



z. Crouch's Method — Stille and Maisch — Feri Subsulphate. 



