440 Combating Lousiness 
are best placed at the sides. As will be seen by reference to pp. 430-1 
the temperature advised by the authors is altogether too high, since 
65-70° C. suffices to kill vermin and the high temperatures mentioned 
injure fabrics (see p. 478). 
This type of oven is based on a good principle in respect to the circu¬ 
lation of the air which is essential in rapid hot-air disinfestation. From 
Fig. 3 A it will be seen that the air is drawn in below at the sides of the 
oven and passes upward between the warmed outer and inner walls 
before it enters the chamber from above; it is then drawn downward 
escaping through interspaces in the range plate and passes out by being 
drawn up the chimney, the latter having a good draught. 
Brick oven erected in front of a fireplace. Rudolph (1915, p. 863) 
describes au oven that may be built in front of any fireplace in a ground 
Fig. 4. Hot-air disinfestor according to Budolph. This consists of brick with a metal door. 
(A) longitudinal vertical section. (B) horizontal section above the floor. (C) transverse 
vertical section. 
lloor room (Fig. 4). It can be erected in a couple of days by soldier 
bricklayers using bricks collected in the vicinity. The temperature 
should not be allowed to rise so that it browns paper (a poor test indeed), 
it being necessary to guard against overheating during the half-hour’s 
exposure period. Hooks or cross rails are fixed within the chamber for 
hanging up clothes and blankets. A whole company’s clothing can be 
treated in a day. The staff required for running such an oven consists 
of a sergeant and three men. 
Railway carriages heated by steam radiators to a temperature below 
boiling-point, the air having been previously partially exhausted, have 
been used in Germany since 1915 (Rose in Med. Fortnightly, St Louis, 
cited in Editorial, vi. 1915, p. 1251). 
