Direction Finding DF Indicator of R.1155 Nav-Com System TBM Avenger This is a Japanese Ammeter

This is a Japanese Ammeter

The transfer button

the pointer rotates clockwise indicating altitude along the outer perimeter scale

as used in early aircraft of the US Army Air Corps

Kearfott began

Direction Finding DF Indicator of R.1155 Nav-Com System TBM Avenger This is a Japanese AmmeterHere 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) comparment. By seeking a signal from a ground transmitter, the indicator displayed the direction of the transmitter in relation to the aircraft by