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This dataset contains tabulations of the heights and times of tidal high and low water at St. Helena from 1 October 1826 to 31 October 1827. The tide was recorded by an instrument designed by Manuel Johnson, a future President of the Royal Astronomical Society, while waiting for an observatory to be built. The tabulations in this dataset were obtained by inspection of photographs of Johnson's tabulation sheets that are held in the archive RGO 6/500 in the Royal Greenwich Observatory collection at Cambridge University Library. It is an important record in the history of tidal science, as the only previous measurements at St. Helena had been those made by Nevil Maskelyne in 1761, and there were to be no other systematic measurements until the late 20th century. Johnson’s tide gauge, of a curious but unique design, recorded efficiently the height of every tidal high and low water for at least 13 months, in spite of requiring frequent re-setting. These heights compare very reasonably with a modern tidal synthesis based on present-day tide gauge measurements from the same site. Johnson’s method of timing is unknown, but his calculations of lunar phases suggest that his tidal measurements were recorded in Local Apparent Time. Unfortunately, the recorded times are found to be seriously and variably lagged by many minutes. Johnson’s data have never been fully published, but his manuscripts have been safely archived and are available for inspection at Cambridge University. His data have been converted to computer files as part of this study for the benefit of future researchers. This dataset supports the paper “Cartwright, D.E.; Woodworth, P.L.; Ray, R.D.. 2017 Manuel Johnson's tide record at St. Helena. History of Geo- and Space Sciences”. Richard Ray (National Aeronautics and Space Administration) and Philip Woodworth (National Oceanography Centre) modified and added figures to David E. Cartwright’s original draft paper and sections of text have been updated, but otherwise the paper is as he intended it. This work was undertaken when Philip Woodworth was an Honorary Research Fellow at the National Oceanography Centre in Liverpool in receipt of an Emeritus Fellowship from the Leverhulme Trust. Part of this work was funded by UK Natural Environment Research Council National Capability funding.
British Oceanographic Data Centre
Other details | ||
Internal code | Internally assigned metadata identifier | 9019 |
Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | Tabulations of ocean tide at St. Helena, 1826-1827 |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | British Oceanographic Data Centre record 1048sthelenatabulation |
File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | f7e5ac8d01665df1b7b3374333b35900 |
Resource Identifier | This is the code assigned by the data owner. | EDMED6590 |
Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 1826-10-01 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 1827-10-31 |
Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | inapplicable |
Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | asNeeded |
Abstract | The abstract provides a clear and brief statement of the content of the resource. | This dataset contains tabulations of the heights and times of tidal high and low water at St. Helena from 1 October 1826 to 31 October 1827. The tide was recorded by an instrument designed by Manuel Johnson, a future President of the Royal Astronomical Society, while waiting for an observatory to be built. The tabulations in this dataset were obtained by inspection of photographs of Johnson's tabulation sheets that are held in the archive RGO 6/500 in the Royal Greenwich Observatory collection at Cambridge University Library. It is an important record in the history of tidal science, as the only previous measurements at St. Helena had been those made by Nevil Maskelyne in 1761, and there were to be no other systematic measurements until the late 20th century. Johnson’s tide gauge, of a curious but unique design, recorded efficiently the height of every tidal high and low water for at least 13 months, in spite of requiring frequent re-setting. These heights compare very reasonably with a modern tidal synthesis based on present-day tide gauge measurements from the same site. Johnson’s method of timing is unknown, but his calculations of lunar phases suggest that his tidal measurements were recorded in Local Apparent Time. Unfortunately, the recorded times are found to be seriously and variably lagged by many minutes. Johnson’s data have never been fully published, but his manuscripts have been safely archived and are available for inspection at Cambridge University. His data have been converted to computer files as part of this study for the benefit of future researchers. This dataset supports the paper “Cartwright, D.E.; Woodworth, P.L.; Ray, R.D.. 2017 Manuel Johnson's tide record at St. Helena. History of Geo- and Space Sciences”. Richard Ray (National Aeronautics and Space Administration) and Philip Woodworth (National Oceanography Centre) modified and added figures to David E. Cartwright’s original draft paper and sections of text have been updated, but otherwise the paper is as he intended it. This work was undertaken when Philip Woodworth was an Honorary Research Fellow at the National Oceanography Centre in Liverpool in receipt of an Emeritus Fellowship from the Leverhulme Trust. Part of this work was funded by UK Natural Environment Research Council National Capability funding. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | This dataset contains tabulations obtained by inspection of photographs held in the archive RGO 6/500 in the Royal Greenwich Observatory collection at Cambridge University Library. The data have been compared with a modern generated tidal analysis. This dataset was passed on to the British Oceanographic Data Centre to be entered into the Published Data Library (PDL) and assigned a Digital Object Identifier (DOI). Instrument(s) used to collect data: sea level recorders. |
Related keywords | ||
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Elevation |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Natural Environment Research Council Designated Data Centres | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | unknown | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Sea level | |
Geographical coverage | ||
North | The northern-most limit of the data resource in decimal degrees | -5.718 |
East | The eastern-most limit of the data resource in decimal degrees | -15.924 |
South | The southern-most limit of the data resource in decimal degrees | -5.718 |
West | The western-most limit of the data resource in decimal degrees | -15.924 |
Responsible organisations | ||
Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
Organisation name | British Oceanographic Data Centre | |
Individual name | Polly Hadžiabdic | |
Position name | Head of the BODC Requests Team | |
Delivery point | Joseph Proudman Building, 6 Brownlow Street | |
Postal code | L3 5DA | |
City | Liverpool | |
Administrative area | Merseyside | |
Country | United Kingdom | |
URL | https://www.bodc.ac.uk/ | |
Role | The owner is the person or organisation that owns the resource. | owner |
Organisation name | National Oceanography Centre (Liverpool) | |
Individual name | Unknown | |
Position name | Unknown | |
Phone | +44 (0)151 795 4800 | |
Delivery point | Joseph Proudman Building, 6 Brownlow Street | |
Postal code | L3 5DA | |
City | Liverpool | |
Administrative area | Merseyside | |
Country | United Kingdom | |
URL | http://noc.ac.uk | |
Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
Organisation name | National Oceanography Centre (Liverpool) | |
Individual name | Unknown | |
Position name | Unknown | |
Phone | +44 (0)151 795 4800 | |
Delivery point | Joseph Proudman Building, 6 Brownlow Street | |
Postal code | L3 5DA | |
City | Liverpool | |
Administrative area | Merseyside | |
Country | United Kingdom | |
URL | http://noc.ac.uk | |
Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
Organisation name | British Oceanographic Data Centre | |
Position name | Director | |
Delivery point | Joseph Proudman Building, 6 Brownlow Street | |
Postal code | L3 5DA | |
City | Liverpool | |
Administrative area | Merseyside | |
Country | United Kingdom | |
URL | https://www.bodc.ac.uk/ | |
Role | The distributor is the person or organisation that distributes the resource. | distributor |
Organisation name | British Oceanographic Data Centre | |
Position name | Director | |
Delivery point | Joseph Proudman Building, 6 Brownlow Street | |
Postal code | L3 5DA | |
City | Liverpool | |
Administrative area | Merseyside | |
Country | United Kingdom | |
URL | https://www.bodc.ac.uk/ | |
Resource locators | ||
Locator URL | Web address (URL) that links to the resource | https://www.bodc.ac.uk/data/published_data_library/catalogue/10.5285/4b2b52d7-ffd9-2473-e053-6c86abc0103b/ |
Locator name | Name of the web resource | Published dataset - doi:10.5285/4b2b52d7-ffd9-2473-e053-6c86abc0103b |
Locator function | Code that describes the function of the resource. ISO function code chosen from ISO 19115-1 Codelist | download |
Dataset constraints | ||
20.1 Limitations on Public Access - Access constraints | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | otherRestrictions |
20.2 Limitations on Public Access - Other constraints | http://inspire.ec.europa.eu/metadata-codelist/LimitationsOnPublicAccess/NoLimitations | |
Data are freely available | ||
21.1 Conditions for Access and Use - Use constraints | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | otherRestrictions |
21.2 Conditions for Access and Use - Other constraints | No conditions apply | |
Version info | ||
Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2018-05-18 |
Date of last revision | The most recent date that the resource was revised. | 2021-04-21 |
Date of creation | The date that the resource was created. | 2017-03-20 |
Metadata date | The date when the content of this metadata record was last updated. | 2021-12-20 |
Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN |
Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 3.1.1 |
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