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| Keywords: ChartersOfFreedom 036.jpg Pure helium from a cylinder at high pressure was passed through a pressure-reduction gage into the humidifying unit center The pure helium was humidified by adding sufficient water vapor to produce a relative humidity of 25 to 35 percent The proper humidity was achieved by passing the helium through distilled water maintained at a temperature of 4 degrees to 6 degrees Celsius The insulated water bath in which the humidification tower was immersed was thermostatically controlled at the desired temperature E C Cretiz of NBS Gas Chemistry Laboratory shown checking the temperature of the bath The arched hose connected the humidifying unit to the gas compressor on the right National Institute of Standards and Technology National Institute of Standards and Technology The images in the ChartersOf Freedom 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 United States Declaration of Independence | ||||
