Contactor Unit BC-608-A of RC-96A System Pipsqueak NOS PV-2 Harpoon while the pointer labeled "M"

while the pointer labeled "M" indicates RPMs of the Engine

The small pointer indicates engine RPM around the inner scale up to 50%

part number 200DCFM

This particular BC-450 was matched with a system comprising of receivers for frequency ranges of 3-6 MC

This is an exceptional example of a Cylinder Head Temperature Indicator

Contactor Unit BC-608-A of RC-96A System Pipsqueak NOS PV-2 Harpoon while the pointer labeled "M"Here 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