That is Rear-Admiral Baskerville, who served under Rodney in the West Indies.
Arthur Conan Doyle, The Hound of Baskervilles
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Dictionary
Merriam-Webster
— a commissioned officer in the navy or coast guard having either of two ranks:
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Macmillan
— an officer of high rank in the navy
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Other Word Forms
rear admirals
Usage
1 use of ‘rear admiral’ in The Hound of the Baskervilles, by Arthur Conan Doyle