Quartz crystal astronomical clocks.

Sollenberger, Paul; Mikesell, A. H.

doi:10.1086/105851

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“…Naval Observatory (USNO; 38.922 • N, 77.067 • W) as a sidereal time standard: that is, a clock that could be directly compared with astronomical observations. By 1946, all pendulum clocks at USNO had been replaced by quartzcrystal clocks (Sollenberger and Mikesell, 1945) but were left in the specially built clock vault (Dick, 2003). Almost 40 years later, Pierre Boucheron, an engineer and amateur horologist, visited USNO to look for information on their clocks' performance.…”

Section: Digital Data In 1984: Shortt-boucheronmentioning

confidence: 99%

Time and tide: pendulum clocks and gravity tides

Agnew

2020

Hist. Geo Space. Sci.

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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.

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Section: Digital Data In 1984: Shortt-boucheronmentioning

confidence: 99%

Time and tide: pendulum clocks and gravity tides

Agnew

2020

Hist. Geo Space. Sci.

View full text Add to dashboard Cite

show abstract

Quartz crystal astronomical clocks.

Cited by 1 publication

References 0 publications

Time and tide: pendulum clocks and gravity tides

Time and tide: pendulum clocks and gravity tides

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