Pitot Tube Type D-1, 369D-012 Beaufort The knob is used to

The knob is used to adjust the altimeter to the barometric pressure as displayed in the small window at the 6 o'clock position

was printed in Nov 1944 and reviews the basic mechanical preventive maintenance checks and lists the technical orders for all other procedures and systems

this Boresight Telescope

This pitot tube is New Old Stock

The B-20 Compass had a small module containing magnets at the top of the compass to compensate for deviation

Pitot Tube Type D-1, 369D-012 Beaufort The knob is used toThis is a WWII era Pitot Tube, Type D 1 (also AN5816 2), as used by aircraft of the US Army Air Force and US Navy, such as bombers B 24 Liberator, B 25 Mitchell, B 26 Marauder, and A 26 Invader, fighters P 39 Airacobra, P 40 Warhawk, and P 47 Thunderbolt, dive bomber SBD Dauntless, and torpedo bomber TBM Avenger (see illustration from the TBM Erection and Maintenance Manual dated 1944). On most bombers, this pitot tube would be mounted on a stanchion