for these cubes tC be placed along thO arce of the several radii f~m the tower. ~cause of practical difficulties, it was agreed with the using setice that they would be set on the chord rather tb of the Wrious radii and each cube wuld face was perpendicularto a radiue mm the arc bS set individually so its the ~-foot line on Aonmn was relocated bSCausO it Ori@mllY tower. The second fell on the liaison airstrip. The only difficultiesencounteredwith this phase of the work retited from losses of material from the original shipment of the prefabricatedtimber structuresand the reinforced Quonset hut. Plywood was substitutedfor the sheathing In the constructionof the two timber structures, ●nd special drills were fabricated to replace those loot with the tool kit shipped with the reinforced Quonset hut. Based on experiencewith the bases for the reinforced concrete bildings the ●ggregate content of ●ll subsequentlypoured concrete was ticreased to 16 cubic feet of aand and 16 cubic feet of coral to produce ● 6 bagmixretkrthan rock a ‘7bag mix. Pouring of the timing ataticn and the blast etructure presented no difficultiesexcept anxnd the door frames. It was necezmary to cut a 41’x I+nopening in the bottom of this frame and place the concrete by hand. Because of time limltatione th timing station on th forms were raaoved from the third day and from the blast stmcture on the seventh day after pourifig. The only honeycomb of consequence occurred in the timing station around one bank of pipes on the fkont wall and thie wee thoroughly cleaned and grouted. Both side walls of the timing etation develo].jdvertical hairline cracks from top to bottom, ● e did 26 section XVI .#@-