Contactor Unit BC-608-A of RC-96A System Pipsqueak Grumman and one adjustment knob

and one adjustment knob

The front mounting bracket is set in place but not screwed in

It consists of a white plastic planisphere with the northern sky on one side and the southern on the other that shows all the stars in the American and the British Air Almanacs

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

This is a nice example of the US Navy's Vertical Speed Indicator R-88-I-750 as used in the SB2C Helldiver Dive Bomber of WWII

Contactor Unit BC-608-A of RC-96A System Pipsqueak Grumman and one adjustment knobHere 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