Projeet 10.2 - TimenofANDivad ~ J. F. Mullaney The ts the arrival method was employed to estimate the yiel:. of ERIE) through wee of hand-held stop watches at Station iste,Parry Island, The shock wave wae heard clearly, and there was almost exact agreement in time interval as measured by several edser~ vers. The time of arrival at the microbarograph station of Project 32.1 at Rniwetok Island was aleo noted by Carter Broylee (Sandia). The times of arrival and ranges of these stations are given in Table 0.21. BEST AVAILABLE COP The weather conditions of interest, as ebeerved at Eni: wean: Preesurp: at shot 1,009.1 sb Temperature: 80.3°F, relative humidity 80.2% Whad: 12 knots fram 100°, with guste to 15. The sound velecity caleulated using the expression 1.4 prpseure/density is 1145 feet per second. A wind of 12 knota frem 100° adds 57 feet to the air path between Ground Zere and the Enivetok station, and 228 feet te the path to Station 1518. The shock wave epeed (still slightly above cownd epeed) in the last third of the path to Bniwetek is then: (Ta TR2 (elias= 1147 fpe ) - oh The sound speed 1145 fpe ie in good agreement with this figure, and ie weed in getting the yield estimates in Table 10.2-1. As was indlested in the report on LACROSSE, an empirical reflection De faster of 1.6 seems appropriste for & land-based surface shot. The, (ERIE) was not a surfece shot but was fired on a 300-ft. tower, Dr. Seasord, Jr., and Carter Broyles point out that in the ease of a tewer shot, the reflection factor should not be applied in calculating the treverse - 39 - . orn “ft - en em, 37 &