Fuel Quantity, Bomb Bay Tanks, DJ-20 Curtiss The knurled rim around the

The knurled rim around the glass lens can be rotated (this one is a bit stiff)

We aren't certain

It was operated in conjunction with the Bendix Gyro Flux Gate compass system or a remote indicating magnetic compass

The long pointer rotates clockwise from the 6 o'clock position indicating altitude in 100 Meters

The interesting aspect of the design of this compass is that the directional mechanism lies horizontally within the rear chamber

Fuel Quantity, Bomb Bay Tanks, DJ-20 Curtiss The knurled rim around theHere is a WWII era or post war era Bomb Bay Fuel Quantity indicator, GE Type DJ 20, model 8DJ20AFM, stock number R88 I 2065 727. This indicator shows the fuel remaining in each of four auxilliary fuel tanks located in the bomb bay of the aircraft: Forward Left and Right Hand, and Aft Left and Right Hand tanks. Each tank has a capacity of 250 US gallons, totaling 1000 gallons in all. Bomb bay fuel tanks were typically installed in the bomb bay for