Oh this is actually very cool.
They would time the gun to a cam on the propellor axle, there was a little bump on the axle that would push the mechanism to fire the gun, but it was placed on the axle in a place that it would only push when the propellor was out of the way of the gun. This technique is used very often still in modern engines to time things properly.
This also kinda meant firing rate was dependent on the speed of the propellor turning.
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