Navigadget Mark I Flight Computer Battle Here is a WWII-era pneumatic

Here is a WWII-era pneumatic Directional Gyro/Turn Indicator made by Jack & Heintz

or patrol observer

illuminated sighting device used on torpedo-carrying airplanes

000 Meters

but that is a guess

Navigadget Mark I Flight Computer Battle Here is a WWII-era pneumaticThis highly unusual Navigadget Mark I Flight Computer is the first and only one of its kind that we've run across. Measuring 10 x 5. 25 inches and painted on aluminum, this device seem intended to be placed on a chart with a scale of 1. 25 inches = 10 miles, with the left "Miles" scale placed along the intended flight path. The center axis intersecting at the 40 Mile mark is the calculated ground speed, from 60 to 150 MPH. The aluminum semi circle