G. H. F. Nutt all 
447 
It takes 2 men ca. 20-30 minutes to load the rods with blankets. The 
coke brazier, kindled about an hour before, is carried in and placed in 
position by two men. The exposure is timed from the moment when the 
thermometer 4 inches above the floor attains the desired lethal tempera¬ 
ture for nits and lice (65° C.). The time required to heat the hut for the 
first time to the requisite temperature is 1 hour at least: on recharging and 
heating up again, it only takes 30 minutes to reach 65° C. The brazier con¬ 
sumes 40 lbs. of coke in the first heating and 20 lbs. in subsequent heatings 
when the hut is in running order. At the end of the exposure, the doors 
Fig. 11. Hot-air disinfestation hut designed by Captain Orr. Model C. 
For description see text. 
are opened and the brazier is carried out, the chamber being ventilated 
and the contents removed, this occupying ca. 20 minutes. The men en¬ 
gaged should be warned against inhaling coke fumes. The floor of the hut 
should be washed down with cresol solution and swept with a stiff broom, 
or subjected to a steam jet after usage to destroy any living lice that may 
linger upon it. Buckets containing water and earth to serve as fire 
extinguishers should be at hand; Captain Grant has told me that con¬ 
flagrations may occur if care is not exercised. 
Orr's hot-air hut (Model C, Fig. 11). Captain Orr informs me 
