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29. Frontal view of Al, post shot, ground zero in direction of left background (see Fig. ii). Fig. 30. Fikring ports sand roof of Alt post shot. 26 I Fig. 31. Wall opposite side firing port of Al, post shot. Fig. 32. 8ide view of Up post shots ground weo to left (ame Fig. 12). I I I, 27 Fig. 33. Firing ports and roof of A2, post shot, looking from the direction of ground zero. I Fig. 3). Side viev oit Au, p~ost shot (see Fig. 12). +* j• ip 28 141 Fig. 35. Firing ports and roof of A4, post shot, looking from the direction of ground zero.
II" I' "1 ,'lll IJill I R x a a a ga R Aa -A g tI 51 III. DISCUSSION 7-Ft by 7-Ft Machine Gun Emplacement. The data obtained 7o from the test of this fortification is considered in the following subparagraphs. a. Overpressure Measurements. Four of the five pressure records obtained in the fortifications appear to be good records. Perhaps because of the severe damage to the emplacement of A5, the gage at this location produced a poor record. However, there appears to be no reason to question the first 50 milliseconds (ms) of this record.
Measurements of peak overpressure and nuclear radiation. Overpressure measurements were obtained with BRL self-recording, pressure-time (pt) gages. A gage embedded flush with ground surface recorded free-field pressure at each of the distances from ground zero. Two gages were mounted on the floor of each machine gun em- placement and held in place with sandbags. These recorded pres-.. sures at approximately 20 in. above the floor. The only other pressure measurements were made in the horizontal tunnels of offset foxholes E2 and E3 where a gage was mounted flush with the bottom of' the middle section of revetment.