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Increased activities in Cryogenic Engineering have brought about the need for a compilation of available data. The purpose of the Cryogenic Data Book is to provide a condensed source of reliable data and reference information for those working in the cryogenic field. Specifically the data were compiled with a view toward the design of liquid hydrogen bubble chambers.

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As recommended in a previous report a study of the NO₂ and HNO₃ exposures of plant personnel in the 224 U Building has been made. Concentrations of NO₂ and HNO₃ from the 224 U roof stack, in the concentrator cells, and in the calcining pot rooms have been determined. The problems have been outlined and recommendations have been made for its alleviation.

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This monthly report details activities of the Manufacturing Division for the month of April 1956.

Report discussing testing of a model of the McDonnell F3H-2N to determine its pitch-up and buffet boundaries and its longitudinal stability and control data obtainable with the pulse-tail technique. Stability was found to be less at low trim angles of attack than at high trim angles of attack up to a point. The buffet boundary was not obtainable through this testing.

A meeting was held in Wilmington on May 15, 1956, with representatives of Allegheny Ludlum to discuss possible production by Allegheny of uranium tubes in the number needed this next year for development work on tubular elements by Savannah River. Allegheny Ludlum, through king, had expressed a possible interest in the manufacture of uranium tubes. The Allegheny representatives, in the meeting, reiterated their interest in trying to determine whether Allegheny should consider entering the business of fabricating nuclear fuel elements and nuclear fuel element components, pointing out that the did not wish to do this work in existing facilities. Woodhouse covered the work done by Nuclear Metals, Inc., on bare uranium tubes. He stated that this work had reached a stage in which there would be needed, for development purposes, a supply of the order of 500 bare tubes at Savannah River over the next twelve months. These will be in excess of Nuclear Metals ability to supply. King as a director of NMI and Pierce as a former director were familiar with the NMI situation. On question by King, Worthington stated the order-of-magnitude of the tube requirements if the development work is successful and tubes are used on a …