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albatross

Overview page. Subjects: Maritime History — Zoology and Animal Sciences.

The albatross is traditionally believed to bring bad luck, and the word is used for a source of frustration or guilt or an encumbrance, in allusion to Coleridge's poem about the Ancient Mar...

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altitude

Overview page. Subjects: Science and Mathematics — Maritime History.

(h or a)

The angular distance of a celestial object above or below the observer's horizon. Altitude is 0° at the horizon and 90° at the zenith. See also Zenith Distance.

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Arctic Ocean

Overview page. Subjects: Maritime History — Science and Mathematics.

Smallest and shallowest of the major oceanic areas, the shallowness being caused by the surrounding wide continental shelves (up to 1 700 km wide). For much of the year the surface is...

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Atlantic Ocean

Overview page. Subjects: Science and Mathematics — Maritime History.

One of the main oceanic areas of the world. It is relatively shallow, having an average depth of 3 310 m; and it is the warmest (average temperature 3.73 °C) and most saline (average...

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carbon fibre

Overview page. Subjects: Science and Mathematics — Maritime History.

Fibres of carbon in which the carbon has an oriented crystal structure. Carbon fibres are made by heating textile fibres and are used in strong composite materials for use at high...

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catenary

Overview page. Subjects: Science and Mathematics — Maritime History.

A curve formed when a chain or rope of uniform density hangs from two fixed points. If the lowest point on the curve passes through the origin, the equation is y = c(coshx/c), where c is...

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condenser

Overview page. Subjects: Maritime History — Chemistry.

A device used to cool a vapour to cause it to condense to a liquid. See Liebig condenser.

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current

Overview page. Subjects: Maritime History — Earth Sciences and Geography.

1 A horizontal movement of water, for example along a stream or through an ocean.

2 The movement or flow of electricity.

3 Occurring...

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drift net

Overview page. Subjects: Environmental Science — Maritime History.

A fishing net that can be several kilometres long and is suspended vertically from floats at a specific depth in the water. It is left to drift freely with the current to catch fish.

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echinoderm

Overview page. Subjects: Science and Mathematics — Maritime History.

A group of invertebrate animals including starfish (asteroids), sea urchins (echinoids), sea cucumbers (holothurians), brittle stars (ophuiroids), and sea lilies (crinoids). The basic...

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