452 
Combating Lousiness 
the hot-air inflow appears to me to be due to heat retained in the fibres 
and the infiltration of hot air into the meshes of the fabric, this infiltration 
gradually progressing until it attains the effects near the outflow. 
The accompanying illustration (Fig. 12) explains the principle of the 
Vondran apparatus. A represents a vertical section with the blower '(b) 
f d 
I I 
i l 
Fig. 12. Vondran hot-air disinfector. Schematic figures illustrating the general 
principle of the apparatus. Modified from Miessner and Lange (1917). 
below which forces air into the adjoining chamber in which clothes, etc., 
are suspended; the air then pursues a course as indicated by the arrows, 
through a circuit and back to the blower on the side where it aspirates. 
By comparing the figures, various dampers will be noticed whereby the 
air current can be directed in different ways as required. In A the 
dampers are arranged while the apparatus is being first heated up. 
