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Day shapes are black in color and their sizes are determined by the ColRegs; for example, the size of the ball is not less than 0.6 metres (2.0 ft). The vertical distance between shapes is at least 1.5 metres (4.9 ft). Vessels of less than 20 metres (66 ft) length may use shapes of smaller size commensurate with the size of the vessel. [2]
Some lightships had two masts, with the second housing a reserve beacon, in case of the main light's failure. Initially, lightship hulls were constructed of wood, shaped like the small merchant ships of the time, but this proved unsatisfactory for a permanently anchored ship, so the shape of the hull evolved to reduce rolling and pounding. As ...
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 ...
Before electricity, light below a vessel's deck was provided by candles, oil and kerosene lamps—all dangerous aboard a wooden ship. The deck prism laid flush into the deck, the glass prism refracted and dispersed natural light into the space below from a small deck opening without weakening the planks or becoming a fire hazard.
A Morse code light is light in which appearances of light of two clearly different durations (dots and dashes) are grouped to represent a character or characters in the Morse Code. For example, "Mo(A)" is a light in which in each period light is shown for a short period (dot) followed by a long period (dash), the Morse Code for "A".
In this approach, the lighters were individually lifted onto the carrier ship by a large gantry crane located at the stern of the ship. The crane could move the entire length of the ship and stack the lighters atop each other in the ship's body and on the deck. The cranes had a load-carrying capacity of more than 500 Mp.
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She was one of six ships in the LS 100 class of lightships, which included LS 100, LS 113, LS 114, LS 115, LS 116 and LS 117. The first light station assignment for the LS 116 was the Fenwick Shoal station off the coast of Delaware, marked FENWICK. In 1933 Lightship 116 was then assigned to the Chesapeake Light Station, about 17 miles offshore ...