Air Position Indicator System Computer 12580-1-B DC-7 and it is available as-is

and it is available as-is with no assurance of its ability to produce photos

and the bubble is full and intact within the glass chamber

Would be a very nice addition to your collection

Measures 3 inches diameter and 1 inch deep

made by Askania (see "Hersteller: bxx"

Air Position Indicator System Computer 12580-1-B DC-7 and it is available as-isThe Air Position Indicator System was an advanced navigational system introduced during WWII in later versions of the Boeing B 29 Superfortress Bomber by the US Army Air Force, including the Enola Gay (see API on navigator's panel). This electro mechanical system computed positions based on a series of dead reckoning inputs. The system maintained a continuous indication of the latitude and the longitude of the air position at any instant, as well as