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Predominantly circular pieces of ice from 30 centimeters to 3 meters in diameter, and up to about 10 centimeters in thickness with raised rims due to pieces striking against one another. It may be formed on a slight swell from grease ice, shuga, or slush or as a result of the breaking of ice rind, nilas, or under severe conditions of swell or waves, of gray ice. It also sometimes forms at some depth, at an interface between water bodies of different physical characteristics, from where it floats to the surface; its appearance may rapidly cover wide areas of water.

Related Terms

PARTS LIST

One or more printed sheets showing a manufacturer's parts or assemblies of an end item by illustration or a numerical listing of part numbers and names; it does not outline any assembly, maintenance, or operating instructions, and it may or may not have a price list cover sheet.

MUDCAP

A quantity of wet mud, wet earth, or sand used to cover a charge of dynamite or other high explosive fired in contact with the surface of a rock in mud blasting.

INERT ATMOSPHERE

A nonreactive gas atmosphere, such as nitrogen, carbon dioxide, or helium; used to blanket reactive liquids in storage, to purge process lines and vessels of reactive gases and liquids, and to cover a reaction mix in a partially filled vessel.

END CAP

A ported or closed cover for the end of a filter element.

AZIMUTH INSTRUMENT

An instrument for measuring azimuths, particularly a device which fits over a central pivot in the glass cover of a magnetic compass.

BEARING BAR

An instrument for measuring bearings, particularly a device consisting of a slender bar with a vane at each end, and designed to fit over a central pivot in the glass cover of a magnetic compass. See also AZIMUTH BAR.

BARE ICE

Ice without snow cover

AZIMUTH BAR

An instrument for measuring azimuths, particularly a device consisting of a slender bar with a vane at each end, and designed to fit over a central pivot in the glass cover of a magnetic compass.

OBSCURATION

The designation for the sky cover when the sky is completely hidden by obscuring phenomena in contact with, or extending to the surface.

CLOUD COVER

That portion of the sky cover which is attributed to clouds, usually measured in tenths of sky covered.

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