Suction Gage, US Navy Oscar Fighter The caption on the photo

The caption on the photo states that this German POA mortar emplacement on the eastern front consists exclusively of Russian Volunteers

This is a complete unbound collection of The Aeroplane Spotter

This is a WWII-era pneumatic Valve

made by Waltham to Air Corps US Army spec #94-27749

Suction Gage, US Navy Oscar Fighter The caption on the photoThis is a US Navy Suction Gage, made by Kollsman. It is labeled as last service at Naval Air Station Quonset Point, RI, in 1953. The Suction Gage measured the amount of vacuum generated to power the pneumatically operated gyroscopic instruments, such as the Gyro Horizon (Flight Indicator), the Directional Gyro, and the Turn and Bank Indicator, as well as automatic pilot systems. The vacuum is generated by either a engine powered vacuum pump or