Airspeed Indicator, 900 km/h, Luftwaffe Fahrtmesser Fl.22234 Lily Bomber or an internal engine-driven compressor)

or an internal engine-driven compressor) and the system of pneumatically-powered flight instruments

where the master switch is a flat toggle instead of a push/pull switch as designed in this B-6

The bracket has one spirit level to ensure that the gunsight body is level perpendicular to the line of flight

When viewing the ground through the scope while in flight

The pointer is calibrated by turning the screw in the lower left corner

Airspeed Indicator, 900 km/h, Luftwaffe Fahrtmesser Fl.22234 Lily Bomber or an internal engine-driven compressor)Here is a WW2 era German Airspeed Indicator FI. 22234, with a maximum airspeed of ~900 km h. As the airspeed increases, rotating the pointer clockwise from the 6 o'clock position, it rotates 360deg past 0 once 800 km h is exceeded, thus following the airspeed index on the inner scale, up to ~900 km h. According to AircraftCockpits. com, this was used in aircraft such as Do335, Fi103, FW190A7 9, Ta152, Go229, He162, He219, Ju388, Bf109G, Fi103, and