Propeller Feathering Switch, 560B24 Signal Corps US Army The white label indicates that

The white label indicates that it has been through Naval Air Station Norfolk VA

Ground Handling and Lubrication

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 (HFDF

This is a Beam Compass Indicator

Propeller Feathering Switch, 560B24 Signal Corps US Army The white label indicates thatThe Propeller Feathering Switch was located on the Pilots' instrument panel or pedestal of US Army Air Force and US Navy multi engine aircraft, one for each engine. In the event of engine malfunction or damage while in flight, the pilot or co pilot 'feathered' the propellor of the stricken engine, which placed the pitch of the engine's propeller blades parallel to the direction of flight. This would prevent the propellor from 'windmilling', or