Mariner's quadrant by unknown

Mariner's quadrant


Fine art poster

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  • 280gsm thick fine art print paper
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    • x cm excluding border ( x in)

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We use a 280gsm fine art paper and premium branded inks to create the perfect reproduction.

Our expertise and use of high-quality materials means that our print colours are independently verified to last between 100 and 200 years.

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Manufactured in the UK

All products are printed in the UK, using the latest digital presses and a giclée printmaking process.

We only use premium branded inks, and colours are independently verified to last between 100 and 200 years.

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We print everything to order so delivery times may vary but all unframed prints are despatched within 2-4 days via courier or recorded mail.

Delivery to the UK is £5 for an unframed print of any size.

We will happily replace your order if everything isn’t 100% perfect.

Mariner's quadrant by unknown zoom

Mariner's quadrant

A polished brass quarter circle with two sights on the right-hand edge. It has a pair of sights, a pinhole sight and a cross-hair sight. The shadow square is used for taking altitudes in surveying. The back of the instrument is blank. Engraved scale along the circular edge of the instrument, from 0 to 90 by 30 arcminutess; the shadow square runs from 0 to 50 to 0 by 1 arcminute. This can be used for making basic surveying measurements. Each scale has a decorative border of overlapping leaves. The instrument has a fitted mahogany box and the sights and plumb bob are probably later replacements.

The mariner's quadrant is a simple instrument that enabled navigators to determine their latitude (position north-south). To use the instrument, the sun or the pole star is observed through the sights and point where the line with the plumb bob crosses the curved scale indicates the altitude of the celestial body above the horizon in degrees. The instrument was developed from the astronomical quadrant, which was known to ancient Greek astronomers and was used in navigation by the mid 15th century.

  • Image reference: F7482-001

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