This is the ultraviolet spectrometer from the Apollo Telescope Mount (S082B). It was designed and developed at the Naval Research Laboratory by a group led by Richard Tousey. The unit flown on Skylab obtained spectra of different solar regions at great spectral and spatial resolution, covering a wavelength range from 970 to 3940 Angstroms. Spectra were recorded on photographic film on an attached camera. A white light TV system allowed the astronauts to point the spectrometer. The artifact is a flight instrument intended for a never-flown second Skylab.
It was stored at the Marshall Space Flight Center until May 1986 at which time it was transferred to NASM.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.