Three 'D' Weapons Sight.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent concerns an improved sighting device for projectile launchers that are mounted on a moving vehicle. It includes a dual parabolic visor slidably positioned on a helmet. The visor is in the form of two parabolas and when locked in position, one parabola is in front of each eye of the wearer. The focal point of each parabola is at a prescribed point on the upper leading edge of the helmet opening. Fiber optic bundles, located at each focal point are connected to cathode-ray tubes and project a series of dots on to the visor in front of each eye of the wearer to simulate, in three dimensions, the trajectory of a projectile, if the rpojectile were fired at any given time.
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