Manuel Johnson's tide record at St. Helena

Cartwright, David E.; Woodworth, Philip L.; Ray, Richard D.

doi:https://doi.org/10.5194/hgss-8-9-2017

Articles | Volume 8, issue 1

https://doi.org/10.5194/hgss-8-9-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

History of geophysical institutes and observatories

https://doi.org/10.5194/hgss-8-9-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 8, issue 1

Review article

|

27 Mar 2017

Review article |

| 27 Mar 2017

Manuel Johnson's tide record at St. Helena

David E. Cartwright, Philip L. Woodworth, and Richard D. Ray

Data sets

Tabulations of ocean tide at St. Helena, 1826-1827 D. E. Cartwright, P. L. Woodworth, and R. D. Ray https://doi.org/10.5285/4b2b52d7-ffd9-2473-e053-6c86abc0103b

Short summary

This paper discusses an historical record of the ocean tide made by the astronomer Manuel Johnson (a future President of the Royal Astronomical Society) at St. Helena in 1826–27. It describes how the measurements were made using a tide gauge of an unusual design, which recorded the heights of the high and low tides well, although information on their times were not so accurate. Johnson’s work is not well known. One objective of the present research was to make his measurements more accessible.