cone of dispersion

cone of dispersion

[′kōn əv dis′pər·zhən]
(ordnance)
The pattern in space formed by phenomena from point sources, such as shots on a target from the same gun, that spread out in conical form.
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On this map, a cone starting at the address of each air permit spreads out in the direction of the prevailing winds (data provided by NOAA) to represent the POTENTIAL CONE of dispersion of the hazardous materials released into the air from the Air Permit(s).