Direction Finding DF Indicator of R.1155 Nav-Com System C-118 It carries a calibration label

It carries a calibration label by Grumman Aircraft Engineering Corporation (GAEC) dated 1968

used to measure and indicate to the pilot the altitude over the terrain during flight

there is a locking screw that captures the rotating ring and preventing unintended rotation

The aircraft had a separate gyro horizon and vertical velocity indicator for routine flight monitoring

This is an original set of Handbook of Operation and Service Instructions AN 05-15-16 May 1944 and Revisions August 1944 for the Gyro Stabilized Flux Gate Compass System

Direction Finding DF Indicator of R.1155 Nav-Com System C-118 It carries a calibration labelHere is a WWII era Direction Finding (DF) Indicator as used in aircraft of the British Royal Air Force, such as bombers Avro Lancaster, Handley Page Halifax, and Vickers Wellington, and patrol bomber Short Sunderland. The DF Indicator received its signal from the R. 1155 receiver in the radio (wireless) compartment. By seeking a signal from a ground transmitter, the indicator displayed the direction of the transmitter in relation to the aircraft by