Air Position Indicator System Computer 12580-3-B & Manual T.O. 5N-3-1-31 PZL as is the glass inclinometer

as is the glass inclinometer

The case is ~5x5 inches and ~11 inches tall

It was also used in versions of US Army Air Corps WWII fighters P-38

the gauge always shows the amount of fuel

part number 671K-03

Air Position Indicator System Computer 12580-3-B & Manual T.O. 5N-3-1-31 PZL as is the glass inclinometerThe 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