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Project 15.2 - HIGH SPEED PHOTOGRAPHY - G. L, Felt
KARLY FIREBALL GROWTH
The observations to be made on themes... high speed photography, were
fireball growth for the first 150 microseconds.
The cameras used were two Node)
100 streak cameras at 500 rps, two at 1,000 rps, two at 4,000 rpe, and two fram,
ing cameras,
The two fastest streak cameras and the framing camera with 16
Shakes per frome used HPS film.
All other cameras were leaded with the Kastuan
color film, and the calor frame camera wrote at 30 shakes per frame.
The
black and white framing camera had the three aided model 8 mirrer that gives 15
shakes per fram.
Al) cameras had & inch lenses on thee except for the two
very alow streak camsras which used 40 inch lenses,
Because of the elevation of
the tower, the horisontal camera slits projected on the cab to an angie abet
two degrees from horisontal,
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Developments for the HPS fila were in the Berry developer, BD7B, for 15
minutes.
The color film was developed for 5 minutes in D-76, axnept for the frem
camera film which was pushed hard to get all the sensitivity possible with 2
oe
minute D-76 development.
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