20 foot deptns. Asat NTS, the mere flexible drums sensed the least pressure, Vibrating Reed Geges, Canisters with vibrating reed gages were buried, at rances of 75 to 200 psi on both shots, with their tops flush to the ground and mounted to the floor of Project 3.2 undvrground structures, Hach reed gaze provided a reading of maximum vertical or radial displacement for a civ frequency; frequencies from 3 to 300 eps were used. show no simple correlation with Plumbbet d2’a, Cactus and Koa re-ults Vertical and radial disvlace- ments for Koa were much lower than expected fron NTS data. Vertical dis- plecements at freonencites less than 1C cps vere lower and for frequencies greater than 100 cps were hizher on shots Cictus and koa thon on Plumbbob. Radial displacements <t i110 psi rar-2 ror ¢:.ctus were about the same as for Plumbbob up to 10 cps and were two tc “uw At similar pressure ranges, Cactu.- ames gretter at higher frequencies, 1° o°l cis lacements were higher at frequencies above 50 cps than these cf (na, “cetus redial displacements at 10 te 50 cps were higher than those of Xca, air Sheck at High \ititudes. Theory indicetes thet the effect of increasing Lhe burst altitude reduces the enervty apperrinz as air blast. On shot Yucca, the objective was to determine the chcracteristic of a blast wave at altitudes of about 90,000 feet in order to provide ar «ccurate basis for scaling to higher and lower altitudes. Five canister: sortaining gages were to be sus- pended by a nylon line et ranzes of 75C' tc 30CO! from the device. Blackout of telemetering due to ionization was expected ab zcro time, but data was to be recorded ond transmitted continuously for severcl minutes after the burst. Canister functions, including turning on the recorders, were to be controlled by a command transmitter eboerd the V3S BCER. Project did not obtain its objective because of failure of this transmitter about two minutes before shot time. One pressure record from the 32°CO' sonist obtained from the direct transmission but apEoares to be spurious, Cop: - Lis, “pare oP ED/D iL RC ee PAGE Po 4]