Published lists in the 18th Century were not always 100% accurate/reliable as to the spelling of names (in any case many spellings were not "standardised" until the mid to late 19th Century). Officers with the same or similar names were sometimes confused - as anyone who has tried to use Charnock's Biographia Navalis would confirm. Another consideration is the common use of "Captain" as a courtesy title for the officer commanding a vessel, who's substantive rank could have been Lieutenant, Master & Commander or Post Captain. Also, until the late 1790s, the rank of Commander was not recognised as a full or permanent commission, i.e. it related only to a specific commission as the commanding officer of a specific vessel - which commission expired when the vessel was paid off or the mission was completed.
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