Probably the solution is in the following extract:
From “British Aircraft Armament – Volume 1” di R.Wallace Clarke, pagg.170-171:
“The profile interrupter protected the airframe.
It consisted of a cam enclosed in a protective covering, which was turned by a pinion meshing with the turret ring gear.
As the turret revolved the cam turned at the same rate.
On the cam, an exact miniature of the portions of the airframe were engraved.
Fitted to the cam cover was a switch box containing three micro switches, and the contact was opened when a micro switch arm struck the engraved part of the cam.
This broke the gun firing circuit and automatically stopped the guns firing.”
Mauro
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