Turn and Bank Indicator, Pneumatic, RCAF Ref No 6AA/77, Type B C-46 since all that is required

since all that is required of him is the proper response to its indicators without the necessity of making any mental computations

This is a dual Oil Pressure indicator as used to measure oil pressure in the left and right hand supercharger sumps in the US Air Force C-121 transport version of the Lockheed Constellation

and some of it has chipped from its pointer (the chips are under the glass

The bombardier could also choose to either manually drop the cache or automatically in 'train'

Turn and Bank Indicator, Pneumatic, RCAF Ref No 6AA/77, Type B C-46 since all that is requiredThis is a WWII era Turn and Bank Indicator, Type B, made for aircraft of the Royal Canadian Air Force, Ref No 6AA 77, made in Canada by Stanley Precision Instruments Ltd. It is in exceptional condition given its age. The glass and case are intact, the level indicator contains fluid and the metal ball, and the lettering is clear and precise. Measures 3. 25 inches diameter and ~5 inches deep.