Che sia un aggeggio che ha a che fare con una eventuale cinepresa montata sull'aereo ??? Dal manuale dello Spitfire 6-9-1940 37. (a) Camera - A G.42B cine-camera is fited in the leading edge of the port plane, near the root end and is operated by the cannon-firing button on the control column spade grip, a sucession of exposures being made during the whole time the buton is depressed, provided the selector switch (5) on the left hand side of the cockpit is ON. (b) A footage indicator and an aperture switch are mounted on the wedge plate above the throttle lever. The switch enables either of two camera apertures to be selected, the smaler aperture being used for suny weather. A stowage clip is provided to receive the electrical cable (13) when the indicator and switch are not fited.
