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Beam angle may be as tight as 8 to 10 degrees in extreme cases, or as wide as around 140° with a plain flat glass port. Even wider angles are possible (exceeding 180°) with a domed port on the light, or a "test tube" light without reflector. LED lights usually use an internal "lens" to produce a focused beam.
A coracle is a small, rounded, [1] lightweight boat of the sort traditionally used in Wales, and also in parts of the western parts of Ireland, particularly the River Boyne, [2] and in Scotland, particularly the River Spey. The word is also used for similar boats found in India, Vietnam, Iraq, and Tibet. [3]
Flat-wick lamps have the lowest light output, center-draft round-wick lamps have 3–4 times the output of flat-wick lamps, and pressurized lamps have higher output yet; the range is from 8 to 100 lumens. A kerosene lamp producing 37 lumens for 4 hours per day for a month (120 hours) consumes about 3 litres (6.3 US pt; 5.3 imp pt) of kerosene.
Roaring Middle light float, off King's Lynn at position 52° 58´·64N., 0° 21´·08E.. A light float is a type of lighted navigational aid forming an intermediate class between lightvessels and large lighted buoys; they are generally smaller than lightvessels and carry less powerful lights. [1]
Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...
More generally speaking, the dory can be defined as a small boat which has: a flat bottom, with the bottom planks fastened lengthwise (bow to stern). a hull shape defined by the natural curve of a sawn plank (never steam-bent). planks overlapping the stem at the front of the boat and an outer "false" stem covering the hood ends of the planks.
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