Geometrical instruments – Straight-line light ray type – Aerial bomb sight
Patent
1979-10-15
1980-11-11
Martin, Jr., William D.
Geometrical instruments
Straight-line light ray type
Aerial bomb sight
33234, 33275R, 33261, 33297, F41G 332
Patent
active
042324491
ABSTRACT:
The bore sighting apparatus or alignment device is comprised of a two-part ring hinged together and provided with a clamp for securing the ring on the muzzle of a howitzer. A pair of hinged witness sights are provided on the ring and a pair of arms extend outwardly from opposite sides of the ring. A vertical arm is hinged on the outer end of each arm with a target and leveling vile being disposed at the top of each vertical arm. A turnbuckle-type device is connected between the upper end of each vertical arm and the horizontal arm for adjusting the vertical arm to a true vertical position. The targets are comprised of a cylinder having a pattern in glass on the viewing end with the opposite end having a smaller opening with a translucent lens to allow the entry of light to illuminate the viewing end. The targets may be sealed and filled with nitrogen to eliminate fogging and a fitting is provided on the rear of the target to accept a collimator lighting source for night bore sighting. A parallax shield is also provided to narrow the field of vision through either of the sighting telescopes to make the sight picture more accurate.
REFERENCES:
patent: 43319 (1864-06-01), Maltby
patent: 752962 (1904-02-01), Eby
patent: 1625060 (1927-04-01), Storm
patent: 1994177 (1935-03-01), Nolan
patent: 2198836 (1940-04-01), Patton
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