Dehumidifying of these buildings, as of others, dictated that they be made as nearly airtight as possible, and in this instance, sprayed- on "cocoon" type vapor seal was applied to walls and underside of the roof. Special rubber seals were designed for all exterior doors, except the large sliding doors provided for installation of equipment, These doors were very rarely used and therefore were simply sprayed with the vapor seal, No windows were provided in the larger building, and the natural light was through the glazed doors. In the smaller standard building, some natural light was obtained by installing standard wood frame screen units of the same type designed for the mess hall and infirmary and by replacing the plastic screen cloth with translucent sheets of plastic. Interior partitioning was accomplished with wood studs and plywood panels, and a four-foot-high plywood wainscot was installed in the large building. All laboratory benches and furniture was selected by the Users. In addition to these buildings deseribed in brief, many other prefabricated aluminum buildings were erected on Parry for use as boiler houses, fire station, recreation building, commissary reefer building, warehouse, etc. In general, where the structures were too small or too complex for economical use of the prefabricated type building, wood framed structures with aluminum siding were used. Buildings of this kind included the guard post, telephone shelter, theatre projection room, etc. Because the prefabricated aluminum building could not economically be used as a theatre and because of the favorable climatic conditions, it was decided to design and construct an open-air auditorium with wooden benches arranged on a sloping fill facing the screen. The seating arrangement was based upon current practice, the maximum and minimum distance to the screen depending upon the "throw" of the projection apparatus and the critical viewing angles, both vertical and horizontal, established within the limits as determined by accepted standards of the motion picture industry. The benches were arranged so that the lines of sight of the viewers to the screen were wminterrupted, The screen size was determined by the limitations of the projec- tion lamp intensity and the magnification of the required image. Design of the screen required a flat matte surface with a reasonable reflectivity factor, without distortion or imperfections. For briefing and lecture purposes a small, raised, wooden platform with railing was placed adjacent to and made a part of the lower right portion of the screen framework. Access to this platform was by means of a wooden frame stairway. To provide a measure of wind control during operation, the several rear rows of seats were sheltered by means of a roofed frame canopy anchored to suitable foundations. The back of this framework was provided with rolled-up canvas curtains between the rear supports. These curtains could be adjusted. 5-1,