Bow sight

For use in conjunction with a weapon of the type which fires a projectile toward a target along a predetermined path of travel and at a predetermined initial speed, a sight for setting the elevation of the weapon comprising:

• an elongated housing having a forwardly facing side and a rearwardly facing side, a first opening formed through said housing sides, and open to said sides of said housing, and a second opening open to said forward side of said housing, said second opening being longitudinally spaced from said first opening,
• means for securing said housing to the weapon so that said housing extends substantially transversely of said path of travel and so that said first opening is substantially parallel to said path of travel,
• a first planar mirror mounted to said housing between the ends of and along one side of said first opening, said first planar mirror being angled with respect to said path of travel so that light travelling longitudinally through said housing is reflected by said first planar mirror through the other end of said first opening and substantially parallel to said path of travel,
• wherein the other side of said first opening is transparent thus allowing a non-reflected image to pass therethrough, and
• a second planar mirror mounted within said housing in alignment with said second opening, said second planar mirror being angled with respect to the path of travel so that light entering said second opening along said path of travel is reflected longitudinally through said housing towards said first planar mirror,
• a parabolically curved lens having a degree of curvature which increases parabolically from one end and to a second end, said curved lens being disposed across said second opening so that said one end of said curved lens is adjacent a top of said second opening so that the curved lens refracts an image of a target to said second planar mirror which varies in position as a function of the distance between the target and the sight and the angle of the housing with respect to vertical so that said parabolic lens refracts an image to said second planar mirror and then to said first planar mirror in which the reflected and non-reflected images are automatically aligned when the elevation of the weapon is accurately aimed to fire the projectile at the target.