was secured to the coral rock by digging a hole roughly 2 feet cube in the rock, filling the hole with concrete and setting the anchor legs of the mounting plate in the concrete, The plate was required to be within 24° of level in both horizontal directions, Sketches for this station were furnished H&N on April 17, 1950. Station 36a, or The Aomon Group, was deleted on November 15, 1950, by the AEC Resident Engineer and was reinstated and relocated by the AEC on February 15, 1951, Station 36c at the same site was relocated on November 17, 1950, and Station 36e, Engebi, was found to be too near the tide line and therefore was relocated on January 22, 1951. Stations 37a, b, and c ebi - NOBL. Another type of side-on pressure mounts were the pylons, These were steel assemblies that were 6 inches in width, 15 feet long and 15 feet above ground level. The skin of this mount was of 1/4 inch hot rolled steel that had been pickled and oiled, The interior supports were a series of four columns. The plate was fastened to the columns by machine bolts whose heads were cx untersunk and ground flush with the plating, The footing to support this metal assembly was of reinforced concrete, 2 feet, 9 inches deep, 17 feet long and 5 feet wide, The original sketches were furnished on June 22, 1950; and on November 1, 1950, it was found necessary during fabrication to add a series of 6 inch I-beam spacers to keep the skin from sagging and to maintain the stipulation that the plate be straight and true in all directions without waves or curves exceeding 1/8 inch, A sample wall-closure plate and sketch were forwarded to H&N on August 15, 1950, by NOBL. stations 37d, «, and f ~ Engebi — NOBL. Adjacent te the pylons were auxiliary units set with the top of cover plate flush with the ground level, These were simply 1 inch cover plates mounted on a vertical piece of 14 inch seamless open hearth pipe 16 inches long, which was in turn cast in a concrete foundation 2 foot cube. The cover plate was drilled to fit the gauges furnished by the User. The original sketches from NOBL were furnished June 28, 1950, Stat = t - NOBL. ‘These stations were 14 foot by 14 foot work tents set directly on the ground and provided with 1 Xw of power, The locations were firmed by J-Division on May 27, 1950. Stations 39a and b - Engebi, and Station 39c - Runit - NOBL. In order to have facilities to care for the balloons while grounded, it was necessary to make a balloon bed approximately 100 feet away from each balloon anchorage (Station 26), The beds were slightly crowned areas 24 feet by 34 feet with two rows 20 feet apart of 2 inch by 1/4 inch steel rings on 6 foot centers to fasten the balloons to the ground. Each ring was required to hold 200 pounds of force from either a horizontal or vertical direction. The sketches for these were furnished H&N on May 27, 1950. 5-162