bubble sextant and case

Army Air Force bubble sextant made by Link Aviation Devices, Inc., Binghamton, NY. For use with artificial horizon only; built-in light for illuminating the bubble; white plastic disc used in a mechanical averaging device. Two extra plastic discs, a spare bubble chamber, a case with spare pencil leads for the averaging device, two spare bulbs for the light, a pencil with a magnifying glass on the end, and a manual included in the storage case for the sextant.