Preparatory to flushing pure helium through the enclosure, copper tubing leading from the source of pure helium was connected to the inlet tube of the test enclosure to flush all aur from the assembly. E. C. Creitz (pictured) of NBS sealed the inlet tube from the helium humidifier to the short tube leading into this enclosure. In front of the enclosure (pictured), the bubble counter and emergency seal on the outlet tube connected to the lower right corner of the enclosure.
National Institute of Standards and Technology
National Institute of Standards and Technology