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Chipping Sodbury Tunnel ventilation shaft Swan St. ventilation shaft on the Burnley Tunnel Ventilation shafts of the Velser tunnel, the Netherlands. In subterranean civil engineering, ventilation shafts, also known as airshafts or vent shafts, are vertical passages used in mines and tunnels to move fresh air underground, and to remove stale air.
A dorade box (also called a dorade vent, collector box, cowl vent, or simply a "ventilator") is a type of vent that permits the passage of air in and out of the cabin or engine room of a boat while keeping rain, spray, and sea wash out.
Construction is of the usual cast brass housing for plumbing parts, with a threaded connection to the pipework at the base. The top has a small outlet, usually hidden beneath a plastic dust cap. Internally there is a large hollow body, normally filled with water, and containing a float valve. The valve must always be installed vertically ...
Johnson Cove) is a cove entered between Pio Point and Pearson Point on the west side of Bird Island, off the west end of South Georgia The name appears to be first used in a 1948 British Admiralty pilot (navigation guide).
From 1903 until 1961, The Hingham Naval Ammunition Depot (originally called the Hingham Naval Reserve) was a major supplier of U.S. munitions, occupying 990 acres (4.0 km2) on the Weymouth Back River (in the section once known as The Hockley).
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