Notes on Mtg, 25 Aug '51
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interpretation harder.
_, This makes observability easier but
D. Fhotography
a.
Ball of Fire
According to Reines' crystal-balling, the ball-of-fire
determination may give the yield to within a factor of 2, this even if
the ball of fire sits on the ground. The guess as to where one could
put cameras and get thie: ~ 10 - 2 miles.
be
High Resolution
Purpose:
to study the travel of the reaction by photo-
graphic observation of the light emitted by a series of holes in the
sides of the device, the difference in time of light appearance in the
holes and time of appearance on the surface being a measure of the tempere-
ture of the hydrogen.
—
Difficulties:
thing can be observed?
Jonized air?
(1) Do the holes close up or move before any-
(2) Cano the surface be seen at all through the
(3) In order to be successful, both the camera and the bomb
must be stable relative to each other because of the small field of view.
(4) The fall-out problem will be sonevhat serious with regard to film
blackening.
According to Brimer, such photography could not be done
at a distance of 20 miles because of air turbulence, He thought it
should preferably be not more than five miles away, although some useful
resulte might be obtained at 10 miles. As for fall-out at this distance,
it is not believed this is an unsurmountable problem.
Te. Bhangmeter
Ho coment.
E.
High-Resolution Spectroscopy —
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Jne
“might look either at the ball of fire itself oF &€ the sun through the
cloud at a later time. The experiment might be feasible at a distance
of 10 - 20 miles.
eo].
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