on July 7, 1950, On July 11, 1950, the User relocated the building. fFurther changes were forthcoming when the User submitted new design data on November 9, 1950. On October 27, 1950, the AEC submitted the power and dehumidification data for 141b and on December 1, 1950, added another door to ldla. Stations 142a and b - The Aomon Group - NRLK. This building contain- ing the two stations--l42a for magnet power supply and 142b for a work shop--was the same as l4la and b for design and dates for data. The size was slightly larger, being 14 feet by 40 feet. station 142c - Engebi, The Aomon Group, and Ey- NRLK. was a trailer furnished by the User. This station station 143 - Engebi, The Aomon Gro and E NRLK. At the base of the zero towers it was necessary to have a pit to provide working space for terminating and joining the coax cables that went either up the tower or out away from the tower. This pit was assigned the station number 143. The enclosed space was approximately 16 feet by 10 feet. The bottom was 5 feet 3 inches below grade, and the top of the coral concrete walls were at grade. A 4 foot wide ramp sloped from station 1l4la into 143. A sump pump was pro- vided at the Aomon Group to drain the pit. The first design data were furnished on July 7, 1950. Four days later the station was relocated. On August 9, 1950 the User submitted some more sketches of the station. On Oetober 24, 1950 the User changed the opening for the cables from 10 inches by 3 feet to 12 inches by 4 feet. The last revision came on November 9, 1950 when the User forwarded his latest location drawings and design data. Station ] - Engebi, The Aomon Gro and E-- NALK. This station was a limonite blockhouse 4 feet by 6 feet by 7 feet high inside dimensions to hold the Ganex tubes, This was another structure with limonite concrete walls (3 foot thick side walls) and roof (4 feet 6 inches thick) and a coral concrete foundation (14 feet by 14 feet 6 inches by 2 feet 6 inches deep). The front face of the structure contained 16 alignment tubes, A rack to hold the tubes was fabricated in the United States in order to assure the close tolerances required by the User. The rack was then held in place by forms and the limonite poured around it. The back wall was left open until a few days before the test, then it was filled with 8 inch cube limonite blocks so as to form a backwall 4 feet thick. The limonite concrete required amounted to 58 cubic yards per station. This structure was dehumidified by equipment located in the building that housed 14A4b. On July 5, 1950, prior to the receipt of any design data, a lead door was requested by the User. This was discarded when the limonite block type of opening was proposed. On October 27, 1950 the AEC approved the User's letter which gave the design data. On November 27, 1950 the User furnished the layout of the station for E+, On November 29, 1950 it was found necessary to move some of the minor structural members of the zero tower in order to give the Ganex tubes a clear sight at the zero point. 9-173