was determined that prefabrication would involve higher costs and shipping delays, designs were made by H & N personnel for job-building. Except those in the infirmary and in the CMR buildings, all cases were H & N designed and job-built. The power plant structure was among the largest structures designed for this site, and use of the standard prefabricated building presented particular problems. The equipment planned for this plant could not possibly be housed in a 24-foot-wide building, nor did the standard building possess sufficient vertical clearance for the installation of engine mufflers, piping, etc. The equipment layout would, however, permit the use of a row of colummson the center line of the long axis. By the use of interior columns, two standard 24-foot-wide buildings were placed in parallel and spaced four feet apart. A special fourfoot-wide aluminum gutter was designed to close the space between the two building units and to drain the roof properly. This presented a total inside building width of 52 feet, which was sufficient for the equipment layout. The standard building required wall studs at four feet on centers, but because the studs forming the interior row of columns would receive no paneling, every other stud was omitted. This practice provided columns at eight-foot centers, with aluminum lintels supporting the roof load between these colimms. To obtain the required head room in this building, the entire aluminum structure was erected on a reinforced concrete wall six feet high and nine inches thick, This wall was pierced as required to provide doorways and vent openings near the floor. After this building had been constructed in accord with original approved design, the addition of the CMR facilities to the program im~ posed additional electrical power load requirements. To fulfill these, an extension of 24 feet was made at the east end of the building to house the sixth generator mit. This extension was of the same construction as the existing portion. Separate structures were designed for the H & N administration building and scientist's administration building. Each of these buildings was planned for construction from the standard aluminum building units, and a study of site restrictions, building areas, and functions led to the development of L-shaped floor plans. The H & N building was subdivided into areas by standard aluminum partitions to provide management offices, drafting room, conference rooms, and telephone equipment and switchboard room. In this structure a fireproof vault for record storage was required, and this was best provided by a reinforced concrete vault placed outside but as close to the aluminum structure as construction would permit. The desig of a weatherproof connection between the vault and aluminum building presented new problems which were solved by the use of special aluminum filler panels and eave gutter. Special attention to detail waa required at the telephone room, as this room required dehumidification to protect the apparatus. A plywood ceiling was installed, and the walls were lined with plywood panels on wood furring. This provided 5-110