CHAPTER II, SECTION 5 123, 125, and 127, were modified to provide day- rooms. THE IBM Building 453 was a re-inforced concrete building 63x90x14-foot high with an 8inch-thick concrete roof slab supported by 12inch walls, concrete beams, columns, and pilasters. A mechanical equipment room, computer room, four offices, engineering room, tape storage room, latrine, Electronic Data Processing Ma- chine room, and an Electronic Analysis Ma- chine room were provided in this building. The Electronic Data Processing Machine room required 1330 square feet of removable plywood floor panels with openings for air intake and cables built over wood joists on concrete piers. All floors, except the compressor and mechanical -quipment rooms, were covered with 4775 square feet of vinyl tile, with rubber base at the walls and partitions. The ceiling was acoustic panels suspended from the roof. The entire building, except for the compressor and mechanical equip- ment rooms, was air-conditioned, with air flow through the walls and under the floors. On Fred, Laboratory Building 582, Enlisted Men’s Club Building 693, Inflammable Storage, Building 653, and the lean-to additionsto Building 118 were all of Butler-type construction. The Explosive Storage Magazine, Building 191, was a re-inforced concrete bunker covered with coral fill. The Decontamination Facilities, Building 143, includede two new wash-down padsfor aircraft, as well as a double PI&S building provided with shower and laundry facilities. Pipeline work for the Fire Protection Sys- tems was started on 24 September 1957 on E!mer, and on 2 October on Fred. The design purpose was to increase the firefighting capacities of the systems and resulted in laying 10-inch transite pipe lines parallel to the existing 6-inch lines, with cross-over connections which made both pipelines a part of the system. Pressure on the lines was maintained at 30 psi. By far the most extensive project undertaken between Operations was the improvement made to the Fred Airfield. Prior to receipt of ES 4 “pF: (Neg. No. W-V-174-6) Figure No. 2-141. Page 282 IBM Equipment Building 453 — 61% Complete.