CONSTRUCTION OF VENTILATORS AND FLOORS II5 
secure better diffusion, an arrangement of the floor 
and generator, as shown in Fig. 68, is recommended. 
This provides for a slat floor, underneath which run 
smooth wooden tubes, three inches in diameter, along 
the diagonals of the room and opening into a hood. 
placed at the center covering the generator. ‘These 
tubes, extending from the center, two-thirds of the 
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SSS 
Detain of GenenatoR 
FIG. 69-——-GENERATOR AND DETAILS OF HANDLING IT 
(AFTER SANDERSON) 
distance to the corner, are open at the ends, and one- 
third from the center, affording eight openings for the 
escape of the gas. 
The bag of cyanide is placed on a shelf and the 
generator in the box, 4, at the end of the sliding 
board, B. This board is pushed down the incline, 
C, and when under the board the outer end is pushed 
down and held in place by a sliding door. ‘The 
shelf upon which the cyanide is placed rests on a 
pivot, as shown in Fig. 69 at VD. Projecting upward 
from itis a rod, &, forming a trap. When the box is 
