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INCH. From the Latin uncia. A measure of length, containing one-twelfth part of a foot.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Nothing says the adjustable altimeter must use inches of mercury. (However, installation of a replacement instrument needs the right paperwork.) The Pacer was type certificated under CAR 3 so there's no requirement for pitot heat and it has no published limitation against IFR flight.
The numbers indicate that this barometer can measure between 29 and 31 inches of mercury. While you can read many barometers to within 2/100 (.02) inch of mercury, readings to 1/10 (.1) inch is normally good enough.
If you're cleaning liquid waste only--sludge for example--it requires a relatively small cfm number but high pressure as measured in inches of mercury, say 25 to 26 inches.
The committee picked a standard calling for the devices to reduce the vacuum to less than 4.5 inches of mercury within three seconds.