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APPENDIX "D"
INCOMING TELETYPE
November 13, 1953
FROM:
J Division,. LASL, Los Alamos, New Mexico
TO:
USAEC, Washington, D. C.
For Charles Marshall from Graves,
Cite J1IG21453.
DOE ARCHIVES
Confirming our telecon of November 12, this laboratory
will interpose no objection to the release of version of IVY
film shown here but Commission should understand that release
represents a change in philosophy.
Major items released are;
one, megaton yields, approximately twelve megatons.
Elemination
of words saying this will not conceal this information from
knowledgable observers; two, Mike was a device not deliverable;
three, Curtiss is an assembly ship for atomic weapons; four,
quick methods of obtaining approximate yields are available, are
called Bhangmeters, and depend on measuring some quantity as a
function of time; five, methods of measuring various effects are
given in much more detail than previously.
We recommend that one
should not adopt the philosophy that since this has been released
one must be more. careful of other information and thereby tighten
up security to such an extent that our work becomes more difficult.
That philosophy might easily give the Commission a very heavy
handicap.
Appendix "pb"
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