Formation Stick for Type C-1 Automatic Pilot System Victor Here is a WW2-era British

Here is a WW2-era British Airspeed Indicator IXE 6A/585 WW2

The screw located on the bottom rear housing can lock the mechanism

the bellow causes a pen scribe to rise along the strip chart

The calculator is essentially a custom 3-panel slide-rule consisting of 4 components:

Formation Stick for Type C-1 Automatic Pilot System Victor Here is a WW2-era BritishThis is a WWII era Formation Stick, was an accessory to the Type C 1 Automatic Pilot System used in US Army Air Force bombers such as the B 17 Flying Fortress and the B 24 Liberator (see illustration from the B 17G Flight Manual dated 1944). The formation stick was used to quickly maneuver the aircraft with minimum physical effort while the C 1 Autopilot was on and the aircraft was assuming, or in, formation flight. Two formation sticks were installed