screw dredge

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• Dredging — Dredge redirects here. For other uses, see Dredge (disambiguation). Dredgers redirects here. For the German municipality, see Dreggers. Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow… …   Wikipedia

• List of Historic Mechanical Engineering Landmarks — The following is a list of Historic Mechanical Engineering Landmarks as designated by the American Society of Mechanical Engineers since it began the program in 1971. The designation is granted to existing artifacts or systems representing a… …   Wikipedia

• harbours and sea works — Introduction harbour also spelled  harbor        any part of a body of water and the manmade structures surrounding it that sufficiently shelters a vessel from wind, waves, and currents, enabling safe anchorage or the discharge and loading of… …   Universalium

• commercial fishing — Introduction  the taking of fish and other seafood and resources from oceans, rivers, and lakes for the purpose of marketing them.       Fishing is one of the oldest employments of humankind. Ancient heaps of discarded mollusk shells (shell… …   Universalium

• railroad — /rayl rohd /, n. 1. a permanent road laid with rails, commonly in one or more pairs of continuous lines forming a track or tracks, on which locomotives and cars are run for the transportation of passengers, freight, and mail. 2. an entire system… …   Universalium

• Drag — Drag, n. [See {Drag}, v. t., and cf. {Dray} a cart, and 1st {Dredge}.] 1. The act of dragging; anything which is dragged. [1913 Webster] 2. A net, or an apparatus, to be drawn along the bottom under water, as in fishing, searching for drowned… …   The Collaborative International Dictionary of English

• drag anchor — Drag Drag, n. [See {Drag}, v. t., and cf. {Dray} a cart, and 1st {Dredge}.] 1. The act of dragging; anything which is dragged. [1913 Webster] 2. A net, or an apparatus, to be drawn along the bottom under water, as in fishing, searching for… …   The Collaborative International Dictionary of English

• Drag sail — Drag Drag, n. [See {Drag}, v. t., and cf. {Dray} a cart, and 1st {Dredge}.] 1. The act of dragging; anything which is dragged. [1913 Webster] 2. A net, or an apparatus, to be drawn along the bottom under water, as in fishing, searching for… …   The Collaborative International Dictionary of English

• drag sheet — Drag Drag, n. [See {Drag}, v. t., and cf. {Dray} a cart, and 1st {Dredge}.] 1. The act of dragging; anything which is dragged. [1913 Webster] 2. A net, or an apparatus, to be drawn along the bottom under water, as in fishing, searching for… …   The Collaborative International Dictionary of English

• Drag twist — Drag Drag, n. [See {Drag}, v. t., and cf. {Dray} a cart, and 1st {Dredge}.] 1. The act of dragging; anything which is dragged. [1913 Webster] 2. A net, or an apparatus, to be drawn along the bottom under water, as in fishing, searching for… …   The Collaborative International Dictionary of English

• drift sail — Drag Drag, n. [See {Drag}, v. t., and cf. {Dray} a cart, and 1st {Dredge}.] 1. The act of dragging; anything which is dragged. [1913 Webster] 2. A net, or an apparatus, to be drawn along the bottom under water, as in fishing, searching for… …   The Collaborative International Dictionary of English