Samuel Plimsoll, who died OTD in 1898, devised the Plimsoll Line, marking the maximum safe draught on a ship's hull https://cromwell-intl.com/travel/france/boat/boat-handling-and-locks.html?s=mb #travel #boating #history
Locks and Canals: Piloting Your Boat Through the Canals of France

How to take your rented canal boat through the locks of canals in France. Don't tie off! Operate the valves and gates with the lockmaster's help.

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The Danes use the word 'plimsoller' for un-sea-worthy boats.... at least they used to, nowadays they probably just scrap them
@samps22 Interesting! I think the English use the name for the "must fill to here" line on pub glasses.