A glare on the underside of extensive cloud areas, created by light reflected from snow or ice-covered surfaces

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Dazzling brightness of the atmosphere caused by excessive reflection and scattering of light by particles in the line of sight.


Blink caused by a snow-covered surface, which is whitish and brighter than the yellowish-white glare of ice blink.


Dark streaks or patches or a grayness on the underside of extensive cloud areas, due to the absence of reflected light from bare ground. Land sky is not as dark as WATER SKY. The clouds above ice or snow covered surfaces have a white or yellowish white glare called ICE BLINK.


The pattern on the underside of extensive cloud areas, created by the varying amounts of light reflected from the earth’s surface. Snow surfaces produce a white glare (SNOW BLINK) and ice surfaces produce a yellowish-white glare (ICE BLINK). Bare land reflects relatively little light (LAND SKY) and open water even less (WATER SKY).


Gross tonnage includes a ships internal volume, excluding such spaces as the peak, double bottom, deep tanks used only for water ballast, bridge, forecastle, open-ended poop, certain light and air spaces, skylights, anchor and steering gear spaces, toilets, the wheelhouse, and certain passenger spaces


Net tonnage is the gross tonnage less certain additional spaces such as crew and officer spaces, chart room, and a percentage of the propelling machinery spaces; also see deadweight, displacement, light and displacement, loaded


The displacement in tons of the ship complete with all outfit, equipment, and machinery on board but excluding all fuel, water in tanks, cargo, stores, passengers, dunnage, and the crew and their effects. The light condition displacement includes the lubricating oil for the machinery and water in the boilers at steaming level. Also called light weight.


An igniter which burns during light off and while the main burner is firing and which is shut off with the main burner.


A framework fitted over a dock opening for admitting light and air into the compartment below


A burner smaller than the main burner, which is ignited by a spark or other independent and stable ignition source and which provides proven ignition energy required to immediately light off the main burner.

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