could short there tions be buried. The 6 inch conduit stopped in a junction box 4 feet of the center pad of the 821 series, and 3 inch conduit went from to the aircraft sections. The sketches and design data for the stawere furnished on June 7, 1950 by J~Division, Until that date, the verbal instructions had been to use the same design as for the 301 stations. SPECIAL EQUIPMENT FOR SCIENTIFIC STATIONS In addition to designing and preparing drawings for the installation of dehumidification and ventilating equipment for certain of the Scientific Stations (For a description and history of this, see Chapter 5.19 of of this volume.), the H & N Mechanical Engineering Department also participated in the design and preparation of drawings for special equipment for NOBL (Naval Ordnance Laboratory and Ballistics Research Laboratory). This equipment consisted of the following: For Stations 20 and 21: For Station 27: Steel field panels for the blast walls. Concrete gauge mounts. For Stations 28 and 29: Instrument posts. For Stations Steel stake gauge mounts. and 34: For Station 36: Gauge mounting plate. For Station 37: Steel pylon assembly and pylon auxiliary. In October 1949, instructions were received from J-Division to pre- pare drawings for a special piece of equipment called a "field panel" for NOBL. H & N was furnished with drawings prepared by the Naval Ordnance Laboratory to use as a guide in the preparation of its drawings. The field panel consisted of two & foot by 5-foot steel panels set parallel and held one foot apart by steel rod spacers welded to each plate, The steel panels were cut out to receive three cylindrical steel chambers and one rectangular steel chamber. Chambers were inserted into the assembly through the cut-outs and were welded at each end to the steel panels. The ends of the steel chambers were machined to receive steel closure plates, of special design, which were held in place by means of machine screws, Early in November, 1949 NOL proposed that a meeting be held between the NOBL engineers and H & N to firm up the design. However, in a telephone conversation between H & N and J-Division on November 16, it was decided to postpone the meeting until later. Meanwhile, drawings were completed and quotations were obtained from two or three local manufactu- rers in order to get an idea of the cost of a field panel. On January 30, 1950, a meeting was held at the Naval Ordnance Laboratory, Silver Spring, Md. Attending were engineers from NOL, BRL, and a rep- resentative of H& N. The design and manufacture of the field panels were discussed, and some slight changes in design were made, A marked set of prints of the NOL drawings was given to the H & N representative and 5-179