room of each station a 12 inch wide shelf was hung 6 inches below the ceiling along the center line of the long axis of the room to act as a cableway and support for instrumentation cables and power cables. these stations is covered in Chapter 5.19 of this volume, Ventilation of Stations 302a, b, c, and d - Engebi - Military Structures Program. These stations were blast proof, camera mounts provided with wing walls. The walls of these stations were two feet thick, the wall facing the struc- ture under camera observation being provided with a flared, rectangular port. The port was furnished with a special glass window which protected the cameras installed in the stations from shock and radiation. The glass was fitted into a special lead lined assembly designed from rough sketches provided by the User. Access to the inside of the stations was provided through the top of each station and this accessway was closed during tests by means of a laminated steel lid, Provision was made for the positioning of a swivel rig for handling the steel lid. Small underground concrete vaults with steel tops were positioned adjacent to the camera stations to serve as containers for batteries which provided power to the cameras, Stations were streamlined by placing an earth fill against the side facing zero, the earth fill being stabilized with a thin layer of gravel. Stations 302e through h, and j throughr - Muzin - Military Structures Program. These stations were camera stations, but in view of the increased distance from zero, it was possible to use a pedestal-type mount two feet square by four feet high on top of which was placed a steel wall cubicle box two feet on each side, the side facing the structure under observation being left open, Station 303a - Engebi - Military Structures Program. This station was a wood frame, aluminum sheath building, approximately 20 feet square, used as a "dry locker" in which delicate scientific equipment could be unpacked without danger of damage by the tropical conditions at the site. Station 351 — Kirinian — Civilian Defense. This station served in the tests of various types of glass and sash. A representative came to Los Angeles in January 1951 and checked with the H & N structural depart~ ment as to the design of the frame building he had drawn to hold the window sash. He stayed in the Los Angeles area until fabrication of the unit was completed and shipped. Approval for erection of the unit at the Proving Ground was authorized by the ABC on January 29, 1951. Stations 421 end 423 through 429 inclusive - Engebi; Stations 4210 through 4212a - aaa station 4213 - Kirinian; Station 4214 - Bokonaarapm; stations and - Teiteiripucchi; Stations 7 through 422) - Eberiru; Station 4222 - Asraanbiru; Station 4223 - Piiraai; Stations 4224, 225, and 4226 ~- Runit —- AFCRL. These stations were all 21/2 foot cube steel boxes made of 1/4 inch or 1/2 inch plate depending upon the overpressure at the various locations. The sketches of these boxes were sent to H& N by J-Division around the middle of May, 1950. The drawings were made, and bids were let for the box fabrication by June 14, 1950. On June 23, 1950 J-Division telephoned the information that the User was going to handle the purchasing, so drawings were sent to him and H & N orders were 2-175