Gf. H. F. Nuttall 
459 
iron boilers into which water can be poured by withdrawing the corre¬ 
sponding wooden bungs from the brickwork above them. The steam 
from the boilers is superheated as it travels along an iron pipe (lumen 
7 cm.) in the back of the fireplace and bottom of the chimney to enter 
the heating chamber near its floor. The advantage in having two boilers 
is that one can be filled without checking the evolution of steam from the 
other. The heating chamber is a double-walled wooden box. The steam 
issues from its top at a temperature of 80-90° C. The space between the 
double-boarded sides (10 cm.) is packed with straw. A door, fastened by 
pegs, opens at one side into the chamber which contains wooden racks 
upon which clothes, etc., are hung. The heating chamber measures 
T2 x T5 x 0-7 m. and admits of the clothing, blankets and bedding of 
6 men being treated at one time, the exposure lasting 50 minutes. The 
effects of 60 men can be disinfested in 10 hours. 
Huts for steam disinfection. The drawback to the foregoing types of 
disinfectors is the small size of the heating chambers which, however, is 
to a certain extent compensated for by using them in groups or “bat¬ 
teries.” Where a large number of effects have to be handled, it is a great 
advantage to have a larger chamber available. 
Captain J. T. Grant, R.A.M.C. (MS. Report, W.O. xi. 1917), has 
described two types of huts which have been found very efficient in 
practice: 
Type A (Figs. 16-19) is provided with a vertical boiler 1 . The 
structure is erected on a concrete platform 4 inches thick. The frame¬ 
work is of wood, covered on the outside with a roof and sides of corru¬ 
gated iron and lined on the inside with uralite. The two-inch space 
between the inner and outer walls is occupied by air in preference to 
sawdust which tends to get wet and leads to loss of heat. A vertical 
partition, similar to the walls, divides the structure into two compartments 
each with a door opening outward; the one compartment contains the 
boiler, the other serves as a disinfecting chamber. A channel in theconcrete 
floor conducts the condensation water outward. Radiator pipes (2 inch) 
run along the walls and ceiling of the chamber, steam entering them from 
the boiler, 6 horizontal radiator pipes running across the ceiling and 6 
1 Although augmenting the cost, it would be a material improvement to sink the 
boiler in a well as is usually done with boilers supplying radiators heated either with steam 
or hot water. The water condensing from the steam in the radiator pipes would not then 
have to be periodically drained off but would flow back by gravitation to the boiler. The 
size of the boiler will naturally have to be determined in accordance with the cubic space 
of the hut. In case galvanized iron is difficult to procure, a single layer of bricks may 
serve instead for the outer wall. 
Parasitology x 
30 
