Sure this was discussed somewhere before but just did not find it so:

Giro gun sight ( Gyro?)

http://www.spitfirespares.com/Spitfi.../gunsites.html

Go half-way down the site page


Worked out the deflection for the pilot. Put the X on the target at any angle and you hit the target. Named also Ace maker because of the rapid increase of Aces after intoduction of this sight.

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