Project 1.8 - CRATER MEASURREATS - Captain F. E. Deeds CasZcrives The objective of this project was to measure the physical character= istics of the crater produced ty detoration of cn atonle weejpcn +t grovd surface, A further objective was to correlate data obtained with previous surface bursts at the Pacific Proving Grounds (PPG) and with the JANGLE surface shot at the Nevada Test Site, The crater is an import-nt effect of a nuclear detonation when used on hard targets or urdergsround c.place: Ms. A thereugh understanding of this phenecona is neccsseay to picdict p.oper? veage to achieve the desired results. MSP MANTATION OR TSCHNTQUSS Poesshob Suiuy: Rays osteniding from ground tiso end OO C.g.023 east 7 a , ¥ od (F's. crater radius “sre surveyed to a distance grcater than the expvcted rlane (6 inches below nean-lev-pater spuings) for Cistenzes out to 450 f.ot from ground ZErO. Uncontrolled stereoptic aerial photographs were taken of shot area, Postshot Survey: Aerial photographs wire taken at H f 240 -sasure crater dlancter with stereoptic equipment. Depth of the crete | above vetler & “teea, can elso be measured by the same means, A USSF REO S sire -tt cguipped with a USAF Aerial mapping Camera,(ta, having a 6-inch-focalJength lens was used to make the rapping runs. The camsra wes gyroscopic stabilized mounted and the intervalonster was set for a forward cverlap of 57 to 62 percent, The aerographic film was developed at the FPG to insure proper coverage of the target and sent to the Enginser Research end - 2 - | Or Le GZ