ad 2-19 weapons for wide area mine clearance by influence moans, The specific ob~ jectives of their experimentation program were to: 1. Measure and record the amplitude, duration, and extent of mine act~- uating influences (pressure, acoustic, and magnetic) that .cev be gene»ated at the sea bottom by the explosion of a loweyield nuclear -veapon in shallow water (approximately 150-depth). 2e Determine the reaction of certain instrumented naval mincs to ‘re influences generated, Three LOU instrumentation platforms were located at distances of 5% ° 20,150, and 44,750 feet from the Umbrella surface zero. Instrumentation vas provided to obtain: 1. The time=pressure history resulting from the shot, including p..es- 2. The time-history of the magnetic-field changes. 3. The time-history of the sound-pressure leve, 2 cps to 40 kew 4. The *imeshistory of displacement of the bottom. sure charges due to waves, swells, and the shock wave. ~ 5. The mine reedtion, inciuding such items as search-coil output, plate-voltage rise, pressurc-switch opening, fires, and "looks". 6. Correlation of all influence measurements enc mine reactions with respect to time. From the Umbrella snot the following tentative conclusions were made: ‘oe oe 208 €% The fifth project studied the effects of nuclear radiation on electronic fuse components and materials, erensered Uy the Diemond O-dranre Fuze L-bora~ swam PAGE “94 2