U.S. Patent Specifications

A sighting mechanism for a gun fixedly mounted with its bore substantially parallel to the fore and aft axis of a dirigible craft, comprising means positionable to control the angular rate of turning of the craft, a sight mounted for angular movement relative to the bore of the gun, and sight adjusting means actuated in accordance with the position of the control means to angularly position the sight relative to the bore of the gun, said sight adjusting means including an element settable in accordance with the range of the target for proportionally modifying the effect of the adjusting means in positioning the sight.