| 摘要 |
A range and elevation determining device serving in one form as a sight for direct fire gunnery. May be in the form of a stadimetric ranging and sight setting device that when adjusted by the gunner to frame a target automatically will dictate proper elevation of the gun muzzle to accommodate known trajectory and range characteristics of certain ammunition and will direct, upon firing the gun, the projectile thereof to a selected kill point on the target. A front sight is provided as a rotatable disk that is pivotally mounted on an upright support on the gun muzzle. It may be a "see-through" or transparent disk. This disk is provided about its axis with a spiraled framing area having curved marginal framing stadia or lines that gradually converge in the direction of disk rotation from point blank or near range toward the longest effective range of the gun on which it is mounted and the ammunition used therein. Framing of the height of the image of a distant target between these marginal stadia automatically will indicate range whether or not such data is readably provided on the device. Preferably the disk is provided with annularly spaced radial lines that are respectively identified by readable range markings. The spiraled framing area may be a slot in the disk. The disk may be a reticule that is rotatably mounted in image planes of optical instruments, such as binoculars, gunner's telescopes and periscopes, and provided with suitable readable markings that inform one accurately of the range and elevation data.
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