Air vessel

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Air´ ves`sel

1.A vessel, cell, duct, or tube containing or conducting air; as the air vessels of insects, birds, plants, etc.; the air vessel of a pump, engine, etc. For the latter, see Air chamber. The air vessels of insects are called tracheæ, of plants spiral vessels.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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At the same instant I saw that the thing that had struck us was the trailing anchor of a rather fair-sized air vessel; possibly a ten man cruiser.
To understand the difference between a pressurized air vessel bursting and a pressurized hydraulic vessel bursting, consider the following.
Readers should be able to make estimates of air vessel capacities, valve closure times, and pump and motor inertias before initiating computer-aided analysis, the publisher says.