Gyro Horizon, Pneumatic, FL22427, Luftwaffe Wendehorizont JU-52 the exhaust valve surface was

the exhaust valve surface was convex

It is a large instrument

Fl32509-4" above "jjb"

and F6F-5N

This value is compared to the disk speed that has been determined by tables of altitude

Gyro Horizon, Pneumatic, FL22427, Luftwaffe Wendehorizont JU-52 the exhaust valve surface wasHere is a WW2 era German pneumatically powered "Wendehorizont" Gyro Horizon FI. 22427, made by Askania. This Wendehorizont was used in aircraft of the Luftwaffe such as twin engine night fighters Messerschmidt ME 110, 210, and 410, and bombers Junkers JU 88, Heinkel HE 111, and Heinkel HE177 Greif. The knurled rim around the glass lens can be rotated, which cages (Fest) or releases (Los) the gyro. It is tight but still rotates. Measures approx 4