October 17, 1951

A. Mr. Smith suggests that we make smoke tests to determine the smoke
dispersal under various conditions. He recommends a Chemical Warfare M-2 smoke
generator which might be obtainable through the Edgewood Arsenal. He has sug-
ested that we write Dr. E. W. Hewson, Round Hill Field Station, M. I. T.,
South Dartmouth, Mass. if we are interested in obtaining this generator.

Smoke may be tracked either by the photographic method or by the use of a
photometric densitometer. It is suggested that photographic tracking would be
sufficient for our purposes. Two movie cameras modified to take one exposure per
two seconds are used, one parallel, and the other, perpendicular to the wind
direction and in appropriate positions relative to the smoke generator. Color
film is recommended in that the detail of the smoke trail is much more dis-
tinguishable in color.

B. It is suggested that smoke tests themselves may constitute a public
relations problem unless they are preceeded by an educational program giving the
public an understanding of the purpose of the tests.

C. Mr. Smith points out that under certain atmospheric conditions the
effluent material proceeds in the form of a pie shaped wedge having a constant
vertical depth of approximately 20 ft. and an angular width of two or three de-
grees. For this reason, he considers it extremely important that we carefully
monitor all buildings and hills projecting above the reactor stack for a radius
of at least ten miles regardless of direction. He considers it entirely possible
that photographic equipment in tall buildings within this radius might be
affected under these conditions.

D. Mr. W. C. Wanta of the U. S. Weather Bureau says that Mr. J. C. Holland
of the U. S. Weather Bureau has written a detailed report of the meteorological
conditions of the Raleigh site within the last nine months.