0.004267 X 0.1865 10,000 0.8 X 1,556 - 1,245 ft. 0.2L. - 249 ft.

from which we see that our effective range is 1,245 ft. and our width of target 249 ft.

When a gas concentration is increased tenfold and all other factors remain the same, the effective range is increased by the cube root of 10, or 2.154 times. The smoke cloud in our example does not realize such an increase over the gas cloud because the vertical rise of smoke is twice as great as that of gas, i.e., K smoke = 2K gas (table, page 63).

Multiple Points of Emission.—In the foregoing discussion concerning the relation between a quantity of chemical and its effective range, we have considered only emissions from a single point. In actual practice, however, the gas-cloud method of chemical attack is always carried out on a large scale over a considerable portion of the enemy's front. To cover such an area the chemical must be discharged from a sector of one's own front bearing relation to the size of the target to be covered, i.e., the chemical is discharged from a large number of cylinders uniformly distributed along a line substantially parallel to the enemy's front and of a length in proportion to the target area.

In order to determine the relation between the amount of chemical and its effective range when discharged from multiple points of emission and the optimum arrangement of these points with reference to the target eH- r> "F' -j eH- r> "F' -j

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