Heavier construction to avoid failure does not appear to be justified in view of the fact that data was obtained. Stations 26a, b, and c - Reinforced Concrete Base. age to these structures. The design was adequate, There was no dam Stations 27 a, b, c, and d - Reinforced Concrete Base. damage to these structures. The design was adequate. There was no Stations 28 and 29 - Instrument Posts on Concrete Blocks. The concrete blocks for these structures were adequate. The pipes outside of an approximately 3500 foot radius withstood the blast, but inside of this area they were blown over. The point of failure was just below the union, and in a few cases the union itself was broken. It was noted that unions were 250 pound, Stations 30a, b, and c ~ Wood Frame Structure. The three stations on the Aomon Group failed partially inthat the doors were blown com pletely into the structure, This blowin occurred because the 3 inch by 8 inch door frames came loose from the sill and plate. The design was weak in method of fastening door frames to sill and plate. Station 30a on Runit showed no blast damage. Stations 30b and c were completely demolished. The lumber in these two structures was com pletely broken and crushed, The three stations on Engebi were substantially destroyed. The face wall in each was intact, but the roof, side, and back walls were nearly a 100 per cent loss. Not only were timber members of the structures cracked and broken, but they were also crushed by the blast. aged. After the E shot, it was reported that these structures were undamThese stations were not used in the E+ experiment. Stations 33 and 34 - Steel Stakes. Very few of these were found; however, because of location it would have required a survey party to relocate them. No damage was noted to those found. It was believed the design was adequate, Station 36 - Corrugated Metal Pipe Set Vertical fromGround Surface to Solid Rock and Gauge Plate. There was no damage to these structures. The design is considered adequate. Stations 37a,b, and c — Double Steel Wall Filled with Concrete on Reinforced Concrete Base, The structure at 37a was blown completely over, the base remaining attached to the wall. The structure at 37b was blown about 45° out of plumb, the failure occurring at the connection between the base and wall. The structure at 37¢ was blown about 10° out of plumb, the failure occurring as at 37b. These structures were designed by the User and were extremely narrow in relation to the height. 9-307