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Tag: Admiralty Chart

Plumbing the Depths: The Challenge of Measuring Sea Depth

8th November 20171st February 2018 Louise Speller

Have you ever looked at an Admiralty Chart and wondered how each of the sea depths were measured? What about before the invention of echo sounding devices?  What did an early oceangrapher use to calculate each fathom? Prior to the early 19th century soundings were measured using a lead line system. A sailor would cast […]

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