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Personal flotation devices being worn on a navy transport . A personal flotation device (PFD; also referred to as a life jacket, life preserver, life belt, Mae West, life vest, life saver, cork jacket, buoyancy aid or flotation suit) is a flotation device in the form of a vest or suit that is worn by a user to prevent the wearer from drowning in a body of water.
Another explanation is the "framing-effects hypothesis", which says that the difference in the separation or gap of the horizontal lines from the framing converging lines may determine, or at least contribute to the magnitude of the distortion. The Ponzo illusion is one possible explanation of the Moon illusion, as suggested by Ponzo in 1912. [3]
As required by the International Convention for the Safety of Life at Sea, a passenger muster drill must be conducted by the ship within 24 hours of departure. [2] However, in the wake of the Costa Concordia disaster, many cruise lines choose to conduct the drill before the ship departs port for the first time. It is the responsibility of the ...
Lifebuoy with emergency light on a cruise ship A lifebuoy floating on water. A lifebuoy or life ring, among many other names (see § Other names), is a life-saving buoy designed to be thrown to a person in water to provide buoyancy and prevent drowning. [1] Some modern lifebuoys are fitted with one or more seawater-activated lights to aid ...
When filming or photographing people, it is common to line the body up to a vertical line and the person's eyes to a horizontal line. If filming a moving subject, the same pattern is often followed, with the majority of the extra room being in front of the person (the way they are moving). [ 6 ]
The Müller-Lyer effect in a non-illusion. One possible explanation, given by Richard Gregory, [14] is that the Müller-Lyer illusion occurs because the visual system learns that the "angles in" configuration corresponds to a rectilinear object, such as the convex corner of a room, which is closer, and the "angles out" configuration corresponds to an object which is far away, such as the ...
The waterline is the line where the hull of a ship meets the surface of the water. A waterline can also refer to any line on a ship's hull that is parallel to the water's surface when the ship is afloat in a level trimmed position. Hence, waterlines are a class of "ships lines" used to denote the shape of a hull in naval architecture lines ...
An imaginary line down the center of a vessel lengthwise. Any structure or anything mounted or carried on a vessel that straddles this line and is equidistant from either side of the vessel is said to be "on the centerline". chafing Wear on a line or sail caused by constant rubbing against another surface. chafing gear
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