A type of weighing scale or balance device, named after its inventor.
Named after Henry Everard, an English inventor who created a type of precision scale in the 18th century. The eponymous term entered English as a proper noun that became a common noun.
Everard scales became so famous for accuracy that their brand name became the generic term for that type of weighing device—this happens more than people realize, and the process is called 'genericide' (when a trademark becomes a regular word).
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