
PLATE II.— BorpEAUx PLATFORM oF D. S. Norris, West Rusu, N. Y. 
The four barrels on the platform are for water only. They are connected, 
near the bottom, by a three-quarter-inch iron pipe. Water is pumped into the 
barrels by means of a windmill. In the bottom of the second barrel from the 
left is a discharge pipe fitted with a leather valve. By means of a lever-and- 
string device this valve may be opened and closed by a man standing on the 
ground. A stock solution of copper sulphate is kept in a barrel on the ground. 
A stock of lime paste is kept in another barrel, formerly on the ground, but 
since the photograph was taken it has been given a place on the platform 
and fitted with a discharge pipe so that the milk of lime may be drawn off 
into the spray barrel as required. 
