268 
Hot Air Disinfestor 
iron. Two 4" pipes enter the chamber on the floor at each side of the door, 
to supply air to the braziers (Figs. 2, 3). 
The chamber which measures 8 ft. x 15 ft. x 6 ft. inside, is constructed 
over the pit. The side walls and back of the chamber are 5" thick. They 
consist of two layers of corrugated iron 5" apart, the intervening space being 
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solidly packed with earth or clay dug from the pit. The corrugated iron 
ceiling, which is supported by stout iron rails, is covered with one foot of 
earth, and a sloping roof is erected above this. 
The corrugated iron floor (Fig. 2) is also supported by stout iron rails. 
128 openings, each measuring 6" x 3" are made in the floor. A space 4 ft. 
