Power Venturi Tube, Double Throat, AN5807-1, Type B-4A Short Stirling and post WWII

and post WWII

It is packed in its original carton

This is a De-Icing Pressure Indicator for the de-icing system used in WWII US Army Air Forces aircraft such as the B-17 Flying Fortress

Oil Pressure

The clock itself measures ~3

Power Venturi Tube, Double Throat, AN5807-1, Type B-4A Short Stirling and post WWIIThis is a nice specimen of the Double Throat Power Venturi Tube used across US military aircraft of the US Army Air Corps Force and US Navy before, during, and post WWII. Made by Sperry, part number 640600. Power venturi tubes provide a source of vacuum for the operation of air driven instruments such as directional gyros, gyro horizons, and turn and bank indicators. The venturi is a tube shaped like a double "V" and has a small opening, called a