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

This is a Japanese Voltmeter

In operation the Rebecca (AN/APN-2) emits a pulse

the pointer rotates clockwise indicating altitude along the outer perimeter scale

so the glass is slightly loose

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