Direction Finding DF Indicator of R.1155 Nav-Com System C-118 which used pressure sensors at

which used pressure sensors at the engines which electrically transmitted the signal to these electrical indicators

but it is there and shows the matching serial #)

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

This is a WWII-era M1 Gunner’s Quadrant

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

Direction Finding DF Indicator of R.1155 Nav-Com System C-118 which used pressure sensors atHere 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