Abstract. Tidal fluctuations in gravity will affect the period of a pendulum and hence the timekeeping of any such clock that uses one. Since pendulum clocks were, until the 1940s, the best timekeepers available, there has been interest in seeing if tidal effects could be observed in the best performing examples of these clocks. The first such observation was in 1929, before gravity tides were measured with spring gravimeters; at the time of the second (1940–1943), such gravimeters were still being developed. Subsequent observations, having been made after pendulum clocks had ceased to be the best available timekeepers and after reliable gravimeter measurements of tides, have been more of an indication of clock quality than a contribution to our knowledge of tides. This paper describes the different measurements and revisits them in terms of our current knowledge of Earth tides. Doing so shows that clock-based systems, though noisier than spring gravimeters, were an early form of an absolute gravimeter that could indeed observe Earth tides.

中文翻译：

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时间和潮汐：摆钟和重力潮汐

摘要。重力的潮汐波动会影响钟摆的周期，从而影响使用此类钟的任何时钟的计时。由于摆钟是直到1940年代可用的最佳计时器，因此人们一直在关注在这些钟表的最佳性能示例中是否可以观察到潮汐影响。第一次这样的观测是在1929年，当时用弹簧重力计测量了重力潮。在第二个时间（1940年至1943年），这种重力仪仍在开发中。在摆钟不再是最好的计时器和可靠的重力计潮汐测量之后进行的后续观察，更多地表明了时钟质量，而不是对潮汐知识的贡献。本文介绍了不同的测量方法，并根据我们目前对地球潮汐的了解重新介绍了它们。这样做表明基于时钟的系统虽然比春季重力仪噪音大，但却是绝对重力仪的早期形式，可以确实观测到地球潮汐。