.> ● [ Lionof a plan to incorporate in a series of general layout maps, cross directive by : referenced to detaded drawings, all test construction requirements. On 1 December 1947, Colonel Tulley arrived at Eniwetok to begin construction of technical facilities required for the proving ground. He was accompanied by Lt. Col. Daniel Kennedy who, with selected members of the Coast and Geodetic Survey on loan to Joint Task Force Seven, set about the accomplishment of a first order triangulation net to cover the test construction. The initial construction force, the 1220th Provisional Engineer Battalion, had arrived at Eniwetok from Hawaii on 28 November and was in the process of unloading supplies and equipment and had started rehabilitation of island facilities. During December construction and survey crews were based on the LST 45. When New Year’s Day arrived, tower foundations on Engebi, Aomon, Runit, and Aniyaanii were completed and survey operations were well along. The drst increment of the 2nd Engineer Special Brigade had arrived from the 21 and General Ogden had assumed command of the atoll. The 18th Company of Engineers had commenced preliminary construction on Engebi. Initial plans called for the housing of about 1,600 officers and men on Eniwetok, with establishments on Engebi, Aomon, Runit, and Parry for 200, 200, 200, and 100 personnel, respectively. As the job progressed this over-all figure of 2,300 was reduced to about 2,100. Construction and rehabilitation of housing and facilities was carried out under the direction of General Ogden, as distinct from the construction duties of the Task Force Staff Engineer at the test sites. Troop construction forces for the proving mound consisted of an Engineer Construction Battalion, made up of four provisional companies plus a maintenance company and a battalion staff. A company was located on each of the test-firing islands and the fourth on Eniwetok. Resident engineers, representatives of the Task Force Engineer, were placed on the construction sites and working arrangements were developed by them in co-ordination with respective troop commanders. Dr. John C. Clark, senior AEC representative, accompanied Colonel Tulley to the proving ground site to make on-the-spot decisions for the AEC. This arrangement continued throughout the construction period to be the point of contact between the Joint Task Force Engineer and the AEC in the field. ‘Three technical consultants to Dr. Clark were present during the period of construction, Dr. R. W. Carlsoni Mr. C. Hedberg, and Mr. L. Jercinovic. “ Col. Lynn C. Barnes, USA, served as project officer for the erection of steel towers. Construction and installations of the proving ground at the three test-firing sites were substantial y the same, Each site provided a 200-foot firing tower placed so that the necessary area and distance for the placement of instruments were available. Each island, save Engebi, had a 75-foot photographic tower. Generators had to be installed at each firing tower, at each timing station, at the control station, and at each photo tower. On Engebi two gamma stations were constructed and on the other two islands three such stations housed the scientific instruments to measure gamma ray intensity. Gamma stations were Iimonite concrete structures. This unusual type of concrete was a mixture of standard cement plus limonite and metal. The finished structure had a rust colored appearance. c.~ ‘.