Contactor Unit BC-608-A of RC-96A System Pipsqueak Grumman but measuring the wingspan as

but measuring the wingspan as the aircraft changed its angles of approach

and one adjustment knob

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a tall pilot might want to climb his aircraft that is actually in level flight

the operating ranges for each parameter are labeled in green/red on each scale

Contactor Unit BC-608-A of RC-96A System Pipsqueak Grumman but measuring the wingspan asHere is an excellent example of the WWII era Contactor Unit BC 608 A, a component of the US Army Air Force's RC 96 A Contactor System intended to work with the the British RAF "Pipsqueak" system. Pipsqueak was a simple radio navigation system used by the British during the early part of World War II. Pipsqueak used an aircraft's voice radio set to periodically send out a 1 kHz tone which was picked up by ground based high frequency direction finding