This is a BS-212 Anton counter shell converted to a UV corona lamp. This was used during the 1950's for field checking the sensitivity of UV detectors used in Naval Research Laboratory programs. This artifact is part of a collection of high energy detectors from the Naval Research Laboratory (see A19880001000-19880017000).
It was transferred to NASM in 1987 and is currently stored at the Garber facility.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.