10 MR. JOHN GRAHAM ON CONSUMPTION 
IJ. Serins or ExrerRiMENntTs (SMALL BOILERS). 
in. Scale cer. 
2 630 { f fe 3 ¢ Feet 
A second set of experiments was made with a similar 
object. The evaporators now employed were three sepa- 
rate plain cylindrical boilers, each three feet in diameter 
and three feet in length, open to the atmosphere, and placed 
close béhind each other, being well set in brickwork. 
