F.Everitt-3 GP-B Setup mockup  Mac Keiser inspects a mock-up of the space vehicle. dewar pump (EDD)  Dewar and pumping station July 1990 dewar alone  The Dewar vessel dewar arrival  Lockheed Martin engineer, Paul Ayres, inspecting the Science Mission Flight Dewar as it arrived from Lockheed at Stanford's HEPL Labs. dewar lift  Looking up at the integrated probe and dewar as it is lifted out of its tilt dolly. lead bag2  This is one of several expanding lead bags that line the cryogenic dewar. This non-flight bag was removed shortly after a series of thermal tests in the late 1980's.
lead bag  Looking down through an airlock into the dewar. The crinkled silver material at the bottom is actually a super-thin lead foil bag, used to electro-magnetically isolate the main instrument package. liquid helium  Looking down through an airlock into the top of a liquid helium dewar. The helium can be seen as liquid in the center of the image. Helium becomes liquid at 2.1 Kelvin. The extreme cold is vital to maintaining the superconducting environment of the gyroscopes. dewar 45deg  Testing the Dewar in the  HEPL Labs at Stanford. porous plug  The porous plug--invented at Stanford, this device allows evaporating helium gas to escape from the dewar, while retaining the superfluid liquid helium inside.