Annie is actually the thirdone of 8 series, “yo of’vhich‘haveSpeenccone ducted in earlier test operations. The result of the series vill:give us much information vhich’can be applied to increasing the efficiency of use of fissiouabdle materials in new veapons. fore The second and seventh shots, Nancy and Simon, are explorations of scientific phenomena urgently needed by the IASL in connection with the research program on thermonuclear and related systems. These are not thermonuclear weapons; indeed, they have little relationship to‘any actual weapon, real or imaginary. They are actually pure nuclear experiments in the realm of temperatures and pressures which cen only be obtained by setting off an atomic bomb. ut ° The fourth shot, Dixie, is an experimental observation of a new and cheap method for initiating a nuclear chain reaction as well as furnishing m re light on the question of vhen and how such reactions: start. ‘ne fifth shot, Bedger, is an experiment to explore a potential new te .uique of not only increasing the efficiency of burn-up of fissionable materials in atomic bombs, but an exploratory experiment in the further use of cheap materials in nuclear explosions. Again, the device is not. @ weapon, but, if it works, the ideas found effective therein will speedily find their way into weapon application. The two Radiation Laboratory experiments (Ruth and Ray) are explorations of the nuclear properties of certain systems, a knowledge of which may prove useful for both conventional and thermonuclear research programs, ‘ oo ee ‘ It will be noted that most of the LASL shots are on towers rather than dropped as air burst bombs. This ie primartly because of the es detailed instrumentation which requires that not only the precise time ; of detonation be known, but that the device be exactly placed and ttat complicated instruments with electronic recording be in its immediate vicinity. With yieldsof! the order of magnitude indicated, such tower shots can be conducted with complete safety. Only when the necessary information can equally well be obtained from a free air experiment are these employed. It should be apparent that these teste cover a wide spectrum of atomic weapon research and development. They supplement in en absolutely essential way the laboratory investigations at Los Alamos, In reality the Nevada Test Site is only an extension of the physics, explosives, chemical, and metallurgical laboratories at Los Alamos to cover the temperntures, pressures, and other phenomens which can only be obtained by on actual atomic bomb explosion. To the IASL, Nevada ALOO wuhh ae “ 4 By :