(Stations 20 and 21) had been approved, subject to minor corrections by NOBL, The drawings were revised and prints issued to the H & N Construc- tion Department for initiating procurement. By letters of July 15 and July 20, 1950, NOL transmitted sketches to H & N showing the special drillings required in the closure plates for the Field Panels, The drawing affected was redrawn, and prints were reissued to the Construction Department immediately in order not to delay fabrica- tion of these assemblies. By letter of August 15, 1950 from NOL, H& N received sketches of the Pylon closure plates, This necessitated the preparation of a drawing to be issued to the Construction Department for use in the fabrication of the necessary plates. By letter of August 28, 1950 from NOL a sketch was received of a Ground Pylon cover plate, Again the H & N drawing affected was revised and reissued to the Construction Department. On October 2, 1950 a representative of NOL visited Los Angeles for the purpose of inspecting the Field Panel and Pylon assemblies being fabricated, A number of questions that had arisen in regard to the manufacture of these assemblies were satisfactorily answered at that time and H & N drawings were corrected to show the necessary changes. On October 23, 1950 a representative of NOL again visited Los Angeles to inspect the first Pylon and Field Panel assemblies. He stated he was pleased with the outcome of the inspection of these panels. At this same time he informed H & N that the circular cover plates for these assemblies should be boxed separately and sent to a location to be designated later. On October 25 instructions were received from NOL to ship certain of the plates to BRL at Aberdeen Proving Ground, Md., and others to NOL at Silver Spring, Md. The remainder were to be shipped to the Field and held in a warehouse for NOEL. On November 10, 1950 the plates for NOL were shipped by R.R. express, and on November 20 those for BRL were shipped air express. This completed the work of the H & N Engineering Division in the Home Office in connection with these assemblies. INTERIOR WIRING FOR SCIENTIFIC STATIONS The Reconnaissance Report of January 1949 discussed the condition of the existing scientific stations as to electrical wiring and made recom mendations for repairs for those structures being considered for reuse. Scientific requirements were not determined at this time, and consequently no designs could be prepared for the facilities. The Supplemental Report dated July 8, 1949 did not add any information with regard to these facilities, The first design criteria was received in May 1950, and the first drawings were released in June 1950. Because of the fact that the majority of these structures were to be of concrete construction designed for use in more than one experiment, it was decided that type TW wire in concealed and/ or surface mounted galvanized rigid steel conduit would be used for wiring. 5-182