218 Rerorr oF THE CHEMICAL DEPARTMENT OF THE 
zontally until it comes under the curing-room which it enters 
directly, as shown at BB BC. The top of the well is tightly 
closed. . "ak 
In Plate XII the cut illustrates the cooling of air in a curing- 
room by forcing the air through cold water. When the ground 
water is within 12 or 15 feet of the surface, then a cistern 5 or 6 
feet in diameter, shaped like a well, may be built, plastering with 
cement as in the case of ordinary cisterns. In this cistern can 
be placed an air duct made of galvanized iron as given in Plate 
XII. The duct should be water-tight. By connecting the 
cistern with the well, fresh water may be added from time to 
time as may be found necessary to keep water sufficiently cool 
to be effective. rape 
In Canada, considerable work has been done in using ice in 
curing rooms to control temperature. Where ice can be 
obtained conveniently and cheaply, this method may be advant- 
ageously utilized. One or more ice boxes are placed in the 
curing-room, so built that air can circulate about the ice and 
into the curing-room. Also compartments, filled with ice, may 
be made adjoining the curing-room on the side or above, pro- 
vided with openings into the curing-room which will allow a flow 
of air over the ice and into the curing-room. 
Where special means are needed to secure moisture, this can 
be effectively done by means of yard-wide strips of any cloth 
material that has good capillary power. The pieces of cloth 
are hung about the room and kept more or less saturated with 
water. Experience will tell how much evaporating surface is 
needed to provide the degree of moisture needed. 
