Altitude and Airspeed Handset, Gunnery System B-29 Superfortress F3D Skyknight This model has two adjustable

This model has two adjustable vanes (peep and far) with prism for viewing compass bearing and spirit level

25 inches diameter by ~ 4 inches deep

changes the barometric display

They are quite difficult to find

I is a straightforward gyro-magnetic compass using magnets for deviation correction of the detector unit (usually located in the tail or wingtip)

Altitude and Airspeed Handset, Gunnery System B-29 Superfortress F3D Skyknight This model has two adjustableHere is an original WWII era Altitude and Airspeed Handset as used in the Boeing B 29 Superfortress bomber. This was a module of the B 29's Central Fire Control System, the remote control gun turret system. This critical component was installed at the Navigator's station in the B 29 (see image of the station from the B 29 flight manual. Handset is at the bottom of the photo). It was his responsibility to ensure that the dials on the handset for