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quadrant

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cardinal mark

Overview page. Subjects: Maritime History.

A buoy, normally a pillar, or spar, buoy. It is used in the IALA maritime buoyage system to show that the deepest water in the area in which it is moored is on the side of the quadrant to...

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Hadley's reflecting quadrant

Overview page. Subjects: Maritime History.

The replacement of the far less accurate Davis's quadrant for taking a sight for the purposes of celestial navigation. It was invented by the English mathematician and scientist John Hadley...

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instruments

Overview page. Subjects: Medieval and Renaissance History (500 to 1500).

Specialized tools used for fine tasks and often with calibrated scales for measurement, instruments are the embodiment of quadrivial learning. Instruments such as the abacus or...

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point

Overview page. Subjects: Maritime History.

1 A division of the circumference of the conventional compass rose on charts and compass cards, divided and subdivided into 32 points, each of 11° 15′. It showed four cardinal...

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quintant

Overview page. Subjects: Maritime History.

A reflecting navigational instrument on the same general lines as a quadrant or sextant, and used specifically for calculating lunar distance. Its arc subtended a fifth of a circle, or 72°,...

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seaman's quadrant

Overview page. Subjects: Maritime History.

Often called the simple quadrant, the earliest instrument used by navigators for measuring the altitude of a heavenly body. It was in the form of a quarter circle of brass or wood with a...

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surveying

Overview page. Subjects: Regional and National History — Early Modern History (1500 to 1700).

Was always of social significance because of the need to define the boundaries of plots of land. In the Renaissance, taxes on agricultural produce, including such relatively expensive crops...

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vane

Overview page. Subjects: Maritime History.

1 A narrow pennant or strip of bunting mounted on a spindle. It was flown at the masthead of a sailing vessel to indicate the direction of the wind, though in most modern...

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