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| Keywords: Cryogenics 005.jpg Master panel board in the hydrogen liquefication plant of the NBS-AEC Cryogenic Engineering Laboratory The two sections on the left were identical in function and were used alternatively depending on which of the two liquifiers was in operation to control the flow of hydrogen through the liquifier The larger dials in these sections recorded and controlled the level of liquid hydrogen and liquid nitrogen in the liquifiers and purifiers regulated pressure and recorded temperature The smaller dials indicated pressure The control for the Joule-Thomson expansion balbe was the central of the three valve controls located just below the row of four smaller dials The end panel section at right contained additional temperature recorders indicators to show the amount of gas in external gas holders a system of lights to indicate those parts of the system which were in operation and the controlls for an emergency venting system The portion of the panel board not shown contained the controls and indicating dials for devices which determined the oxygen and nitrogen content of the hydrogen From NBS-AEC Cryogenic Engineering Laboratory in NBS Summary Technical Report 1736 August 1953 National Institute of Standards and Technology National Institute of Standards and Technology The images in the Cryogenics Photographic Collection are in the public domain and are not subject to copyright in the United States However please pay special attention to the individual works to make sure there are no copyright restrictions indicated Individual works may require securing other permissions from the original copyright holder Use of the images from NIST Digital Collections is not restricted but a statement of attribution is required Please use the following attribution statement National Institute of Standards and Technology Digital Collections Gaithersburg MD 20899 PD-USGov National Bureau of Standards National Institute of Standards and Technology Cryogenics | ||||
