发明授权
- 专利标题： Levelling instrument
- 专利标题（中）： 水平仪
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申请号： US3793735D申请日： 1972-05-10
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公开(公告)号： US3793735A公开(公告)日： 1974-02-26
- 发明人: HUMPHREY D
- 申请人： HUMPHREY D
- 专利权人： D Humphrey
- 当前专利权人： D Humphrey
- 优先权： US25233972 1972-05-10
- 主分类号： G01C9/00
- IPC分类号： G01C9/00 ; G01C9/12 ; G01C9/24
摘要：
A levelling instrument wherein a level condition is indicated by the projection of a light beam within the instrument on an indicator. The light beam is projected in a constant vertical direction by a reflecting surface that is rotatable about a light source, which is focused on the indicator only when the instrument is level. The reflecting surface can comprise a pendulum mirror or a continuous circular conduit partially filled with mercury.
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