Country of Origin: United States of America
3-D Test (Tubes): 14 x 1 x 1cm (5 1/2 x 3/8 x 3/8 in.)
3-D Test (Plastic Box): 17.8 x 7.6 x 3.8cm (7 x 3 x 1 1/2 in.)
These aluminum tubes act as a set of collimators to restrict the field of view of a proportional counter that is one of the flight spares from the SAS-1/Uhuru satellite. The Uhuru satellite, launched in 1970, was the first earth-orbiting spacecraft dedicated exclusively to X-ray astronomy.
The Smithsonian Astrophysical Observatory transferred this counter to NASM in 2002.
Transferred from the Harvard-Smithsonian Center for Astrophysics.