You know what it looks like… but what is it called?
TAKE THE QUIZ“SPURLING”
The following 2 entries include the term SPURLING.
spurling line
noun: a line by which the turning of a ship's wheel moves the indicator of a telltale
spurling pipe
noun: a pipe or tube through which an anchor chain passes to the chain locker below the deck of a ship
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Merriam-Webster unabridged