An Account of Operations Carried on for Ascertaining the Difference of Level between the River Thames at London Bridge and the Sea; And Also for Determining the Height above the Level of the Sea, &c. of Intermediate Points Passed Over between (.....)
Book details
- Title
- An Account of Operations Carried on for Ascertaining the Difference of Level between the River Thames at London Bridge and the Sea; And Also for Determining the Height above the Level of the Sea, &c. of Intermediate Points Passed Over between (.....)
- Publication year listed
- 1831
- Format
- Public domain eBook
- Reading access
- Free online reader; no registration required
- Source record
- View on Archive.org
About this book
An Account of Operations Carried on for Ascertaining the Difference of Level between the River Thames at London Bridge and the Sea; And Also for Determining the Height above the Level of the Sea, &c. of Intermediate Points Passed Over between (.....)
Author: John Augustus Lloyd
Year: 1831
This scientific paper details a high-precision survey commissioned by the Admiralty and the Royal Society to determine the exact difference in level between the River Thames at London Bridge and the sea at Sheerness . The author describes the development of specialized "levelling instruments" and station staves designed for "scrupulous exactness" . The work includes rigorous field operations across marshes and through various towns, establishing "standard marks" at key locations such as Greenwich Observatory, the West India Docks, and the Tower of London to serve as permanent vertical datums . It also provides comprehensive data on mean sea levels, spring tides, and neap tides recorded throughout 1830 .