Directional Gyro, Aircraft Instrument Manuf., 200DCFM Douglas Here's a helpful video on

Here's a helpful video on the Astrograph from a fellow enthusiast

as used in the US Air Force Strategic Bomber the B-36H Peacemaker (see illustration of the B-36H Engineers Station Panel from the B-36H flight manual dated 1954 showing the location of this indicator with the right red dot)

The part number has been confirmed in the B-17F Erection and Maintenance Manual dated 1942 and the G model dated 1944

The face is embossed BU AERO US NAVY (i

200 inches

Directional Gyro, Aircraft Instrument Manuf., 200DCFM Douglas Here's a helpful video onThis is a slaved Directional Gyro made by Aircraft Instrument Manufacturing for Aviation Safety, part number 200DCFM. Measures 3. 25 inches diameter and ~10 inches deep. The glass is clear and intact. The knob rotates the compass card to select the desired direction of flight.