Air gauge
a gauge for measuring air pressure.
historical examples
two minutes previous the old engineer had asked him to go out on the locomotive to adjust some fault in the air gauge.
ralph on the engine allen chapman
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- Airglow
a dim light from the upper atmosphere caused by emissions from atoms and molecules ionized by solar radiation: observed at night (nightglow) during the day (dayglow) and at twilight (twilight glow) with each having slightly different characteristics. noun the faint light from the upper atmosphere in the night sky, esp in low lat-tudes airglow (âr’glō’) […]
- Air hammer
a pneumatic hammer, usually portable.
- Air harbor
a harbor for hydroplanes, especially seaplanes.
- Air hardening
noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air. noun a process of hardening high-alloy steels by heating and cooling in a current of air compare oil hardening
- Air hoist
a pneumatic hoist.