Direction Finding DF Indicator of R.1155 Nav-Com System PV-1 Ventura The booklet describes and illustrates

The booklet describes and illustrates a number of aerial tactics in lay terms

(The prism has a small chip in its lower left corner)

The thumbscrew on the end of the device loosens

for Air Corps US Army

Direction Finding DF Indicator of R.1155 Nav-Com System PV-1 Ventura The booklet describes and illustratesHere 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