海洋的潮汐高度，好几个海港都保留着几个世纪的记录（阿姆斯特丹从1700年起就有记录，利物浦从1768年开始，斯德哥尔摩只从1774年开始，还有很多地方则是从1850年开始）。
Records of tide height have been kept for centuries at several seaports (Amsterdam since 1700, Liverpool since 1768, Stockholm since 1774, and many other places since 1850).
用 途：自动记录江河、湖泊、水库涵闸及潮汐等水位变化过程。
Application: It is used for records of the water level change process of the river, lake, reservoir and etc.
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