a tightly sealed room. The dehumidifying equipment was installed outside the building and adjacent to the room. The scientist's administration building was of the same general type as the H & N building. Aluminum partitions divided the building area into office space, conference rooms, toilet rooms, etc. Originally toilet facilities were provided for women employees, but following instruction to the effect that no women were to be provided for at this Project, the plans layout was revised and this space was used for additional offices. In each of these buildings, the L-shaped plan caused a problem in connecting the two wings. This was solved by the means of a special gutter similar to that used on the mess hall. Arrangement of these buildings in spaced relationship on the site formed a U-shaped layout. The two buildings were then connected at the bottom of the U by a roofed passage of a11 aluminum construction. The colums supporting this roof were cut from standard interior partition post and the roof fabricated from aluminum rafters. Roof panels were standard with those of the buildings. Subsequently, along with the increase in the scope of the experiments, came the demand for more office space for scientific and AEC personnel. To provide the space, plans were prepared and construction undertaken to remove the covered passage between the buildings and install in its place approximately 1380 feet of standard prefabricated building, thus making two L-shaped buildings into one U-shaped structure. As a facility for the repair and maintenance of instruments used by the various groups participating in the experiments, a large Tshaped building was designed. This structure, composed of intersecting standard aluminum buildings,was partitioned to form laboratories and a common machine shop for the separate groups involved. Certain of these laboratories required dehumidification; these were centrally located within the building in order to obtain an economical arrangement of duct work and equipment. For adequate sealing of rooms for dehumidification, all openings in the exterior roof and wall construction were filled with sponge rubber plugs, and the interior roof and wall surfaces sprayed with a "cocoon" type vapor seal, About this building were grouped the photo laboratory, counting and sampling laboratory facilities, and two separate laboratory buildings pertinent to the experiments. These structures, along with the instrument laboratory building and the H & N and scientists administration buildings, were enclosed in a common security compound. Following the decision, in July 1949, to establish the Task Force Headquarters on Parry, the planning of a building to provide the necessary office space and facilities was initiated. In addition to office space for the Commanding General and his staff, space was provided for conference rooms, message center, code room, etc. Because of the restrictions imposed by the use of a standard building type, an Eshaped plan seemed best suited both in terms of fimction and construction . Essentially, the message center, code room, teletype and 5-111