Power Venturi Tube, Double Throat, AN5807-1, Type B-4A Short Stirling It is packed in its

It is packed in its original carton

as appeared in the Co-Pilot's Panel on the post WW2-era Boeing B-50D Superfortress Very Heavy Bomber

as used in aircraft-carrier-based Grumman Cougar F9F-5 and North American Fury FJ2 Jet Fighters

The clock itself measures ~3

and post WWII

Power Venturi Tube, Double Throat, AN5807-1, Type B-4A Short Stirling It is packed in itsThis 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