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rear boundary of the target, its concentration will have fallen below the required effective strength. As an illustration of this point, let u» assume that the discharge from the cylinder mentioned above travels over a target 200 ft. deep whose front edge is at the distance L « 1,050 ft. from the cylinder emplacement. We shall also assume that the cylinder is emptied in 2 minutes, so that, by the time the first chlorine discharged reaches the front edge of the target, the last chlorine will have just been released from the cylinder. Traveling at the rate of 6 miles per hour (528 ft. per minute) it will require 0.40 minute for the cloud to pass over the target area. During this time, the cloud will expand to the larger

Fig. 2.—Travel of X** clouds.

dimensions indicated by ('0 letters in Fig. 2. At the same time, the rear part of this volume, following the expiration of the cylinder discharge and indicated by (') letters, will be uncontaminated air.

A BCD = target area: AD - 200' Assuming average field conditions,

R" = 0.2S" = 312.6' I" «= S" - R" = 1,250' F- 0.165" = 25V H." - 0.1S" = 156.3'

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