发明授权
- 专利标题: Magnetic compass
- 专利标题(中): 磁罗盘
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申请号: US906427申请日: 1978-05-16
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公开(公告)号: US4175333A公开(公告)日: 1979-11-27
- 发明人: Melvin G. Kramer
- 申请人: Melvin G. Kramer
- 申请人地址: WY Riverton
- 专利权人: The Brunton Company
- 当前专利权人: The Brunton Company
- 当前专利权人地址: WY Riverton
- 主分类号: G01C17/06
- IPC分类号: G01C17/06 ; G01C17/10 ; G01C17/04
摘要:
A magnetic compass has been devised which is of the type having a pivot point displaced above the plane of the permanent magnets so that the distance of displacement of the pivot point with respect to the center of force will reduce the tilt angle or tipping otherwise caused by changes in latitude when the compass is to be operated in different parts of the world and a spherical needle bearing can be employed at the pivot point as a result of the increased pendular effect achieved by displacing the pivot point above the magnets. The need for a lift assembly to cushion the pivot point is eliminated while providing for an extremely rugged and versatile magnetic compass which will serve as a light, portable pocket transit capable of measuring horizontal and vertical angles as well as being used as a prismatic compass, level, clinometer, plumb or alidade.
公开/授权文献
- US4758281A Anti-corrosive protective coatings 公开/授权日:1988-07-19
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