Hour meter

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Alternative term: Run-hour meter, elapsed-time meter

An instrument that indicates the time during which a device or machine has been in operation.

Note: If the device is used with a rotary machine, the term running-hours recorder is also used.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

nertia of the water plane

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM