CONSTRUCTION OF VENTILATORS AND FLOORS 115 



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 



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, A, 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 D. Projecting upward 

 from it is a rod, E, forming a trap. When the box is 



