Rate of Climb / Vertical Airspeed Indicator Pioneer 1625-1Q-C1 TBM Avenger but we have found it

but we have found it in the flight manual of the F-94C Starfire Fighter dated 1957

The black projector was installed above a map table at the navigators station at the height specified by the height gauge included in the kit

this Boresight Telescope

Reference Number 41-7954

the faceplate rotates to indicate the selected frequency within the small metal frame (to which a small lamp could be affixed for illumination)

Rate of Climb / Vertical Airspeed Indicator Pioneer 1625-1Q-C1 TBM Avenger but we have found itHere is a WW2 vintage Rate of Climb (Vertical Airspeed) Indicator, made by Pioneer, similar to those used in the US Navy's PBY 5A Catalina. It was for aircraft with shallow slow climb descent speed i. e. maximum 2000 ft minute. The pointer is calibrated by turning the screw in the lower left corner. The inside of the glass could use some cleaning. Measures 3. 25 inches diameter and 4 inches deep.