Project 15,2 - HIGH SPEED PHOTOGRAPHY - G, L, Felt
EARLY FIREBALL GROWTH
Ss
The observations to be made on a using high speed photography, were
fireball growth for the first 150 microseconds.
The cameras used were two Model
100 streak cameras at 500 rps, two at 1,000 rps, two at 4,000 rps, and two framing cameras.
The two fastest streak cameras and the framing camera with 16
shakes per frame used HPS film,
All other cameras were loaded with the Eastman
color film, and the color frame camera wrote at 30 shakes per frame.
The
black and white framing camera had the three sided model 8 mirror that gives 15
shakes per frame,
All cameras had 80 inch lenses on them except for the two
very slow streak cameras which used 40 inch lenses,
Because of the elevation of
the tower, the horizontal camera slits projected on the cab to an angle about
two degrees from horizontal.
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