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    • 5. 发明授权
    • Chronometer with tide indicating means
    • 计时表带潮汐指示装置
    • US5111439A
    • 1992-05-05
    • US532699
    • 1990-06-04
    • Raoul-Henri Erard
    • Raoul-Henri Erard
    • G04B19/26
    • G04B19/266
    • A chronometer having a tide grid comprising a contour line indicating at least one complete tide cycle and a superposed reading grid comprising at least one read-off reference mark. One of the grids is driven in rotation at a constant angular speed about an axis. The grids are concentric about that axis and the read-off reference mark is radially disposed relative to that axis The contour line indicates tides on polar coordinates such that the distance of a point on the contour line from that axis indicates the height of the tide. The radial read-off reference mark intersects the contour line at a point which indicates the height of the tide for the time shown by the chronometer for a specific geographical location.
    • 具有包括指示至少一个完整潮汐循环的轮廓线的潮汐网格的计时器和包括至少一个读出参考标记的重叠读取网格。 其中一个网格围绕轴线以恒定的角速度旋转驱动。 栅格相对于该轴线是同心的,并且读出的参考标记相对于该轴线径向设置。轮廓线表示极坐标上的潮汐,使得轮廓线上的点与该轴线的距离表示潮汐高度。 径向读出参考标记在指示由特定地理位置的天文台显示的时间内的潮汐高度的点处与轮廓线相交。