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Messenger Line
A messenger line or just messenger is relatively light cordage used to pull a heavier cable across a gap or through a tube or duct. The term is also used for a line used to pull or lower a package along a downline or jackstay. A heaving line Vomiting (also known as emesis and throwing up) is the involuntary, forceful expulsion of the contents of one's stomach through the mouth and sometimes the nose. Vomiting can be the result of ailments like food poisoning, gastroenteritis ... is a rope with a weighted end which can be thrown relatively easily across a gap. If it is attached to a heavier line, warp, or chain and then used to pull the heavier line across the gap it is being used as a messenger line. The name ''heaving line'' refers to the function of pulling the line, and ''messenger line'' to the function of transferring the object it is fastened to. Applications * A heaving line thrown from a ship to shore then used to pull the mooring warp from the ship to a bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coast Guard Sailor Deploys A Messenger Line
The coast, also known as the coastline or seashore, is defined as the area where land meets the ocean, or as a line that forms the boundary between the land and the coastline. The Earth has around of coastline. Coasts are important zones in natural ecosystems, often home to a wide range of biodiversity. On land, they harbor important ecosystems such as freshwater or estuarine wetlands, which are important for bird populations and other terrestrial animals. In wave-protected areas they harbor saltmarshes, mangroves or seagrasses, all of which can provide nursery habitat for finfish, shellfish, and other aquatic species. Rocky shores are usually found along exposed coasts and provide habitat for a wide range of sessile animals (e.g. mussels, starfish, barnacles) and various kinds of seaweeds. Along tropical coasts with clear, nutrient-poor water, coral reefs can often be found between depths of . According to a United Nations atlas, 44% of all people live within 5 km (3.3mi) of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Downline (diving)
In underwater diving, a downline is a piece of substantial cordage running from a point at the surface to the underwater workplace, and kept under some tension. It can be used as a guideline for divers descending or ascending, for depth control in blue-water diving, and as a guide for transfer of tools and equipment between surface and diver by sliding them along the downline at the end of a messenger line. A shotline is a special case of downline which uses a heavy weight at the bottom and a float at the top. A jackstay is a more lateral equivalent, that commonly follows a surface, and will not usually allow materials transfer without a messenger line from the destination end. Arrangement and use There is no definitive arrangement. A downline is a generic piece of support equipment that can be set up using available components and is defined by its function. The top end can be secured to any suitably secure point in an appropriate place. This can be a large float or buoy, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jackstay
A jackstay is a cable or bar between two points to support and guide a load between those points, or as an anchor to attach something to be constrained along that line. The term is mostly used in a marine context and originated on sailing ships. Note the use of "stay" implies load bearing working rigging. In diving it is also a line to guide the movements of a diver between the endpoints. Nautical applications Jackstays are used in several maritime applications. These include: * Support and guidance for transfer of personnel and materials between vessels at sea (Replenishment at sea), suspended from a traveller block and controlled by lines running in both directions. * Support and guidance for rescue or transport by breeches buoy, * A rope or rod secured along a vessel's spar to attach an edge of a sail or the end of a gaff, * A rope or rod running vertically on the forward side of the mast on which the yard moves. * A stay for racing or cruising vessels used to steady the ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heaving Line
Vomiting (also known as emesis and throwing up) is the involuntary, forceful expulsion of the contents of one's stomach through the mouth and sometimes the nose. Vomiting can be the result of ailments like food poisoning, gastroenteritis, pregnancy, motion sickness, or hangover; or it can be an after effect of diseases such as brain tumors, elevated intracranial pressure, or overexposure to ionizing radiation. The feeling that one is about to vomit is called nausea; it often precedes, but does not always lead to vomiting. Impairment due to alcohol or anesthesia can cause inhalation of vomit, leading to suffocation. In severe cases, where dehydration develops, intravenous fluid may be required. Antiemetics are sometimes necessary to suppress nausea and vomiting. Self-induced vomiting can be a component of an eating disorder such as bulimia, and is itself now classified as an eating disorder on its own, purging disorder. Complications Aspiration Vomiting is dangerous if g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Two Six Heave
"Two, six, heave" is a phrase used to coordinate seamen's pulling. As used by sailors, the person at the front of the team will typically call out the "two, six" part of the chant. During this phase all members move their hands up the line ready to pull. This is followed, in its natural rhythm, by the "heave", called out by the whole team together. At this moment, the team simultaneously lean back on the line, and use their leg muscles to exert a powerful pull upon it. This coordination takes some practice to achieve, but the difference in applied power between a raw group pulling as individuals and a practiced team hauling together is very significant. There is not a single tempo or cadence for the chant, since this will depend on the task in hand. For example, hauling in the upper topsail halyard will require a long, heavy pull; if the team is not to be exhausted halfway through then the leader must ensure that the pace is slow enough to be maintained throughout the job. Hauling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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