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Elegant gifts arrow Nocturnal and tide computer

Nocturnal and tide computer



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Price per piece: €59.00 (including tax)

 

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  • diameter: 9,5 cm,

  • made of solid brass

  • hardwood display stand included

  • instrument  is fully functional

  • information booklet included

  • elegant box included


The piece is a replica of a Nocturnal and Tide Computer from 1570, signed by Humphrey Cole, that can be found in the British Museum, London.

One of its faces is a Nocturnal and the other is a Tide Computer. The Nocturnal or star clock is an artifact that is used to obtain the time at night using the fixed stars in the sky. The abacus or tide computer is used to figure the time of the tides, that greatly affect navigation both in harbors and for fishing.

The pointer located on top of the meridian ring (outer ring) is used to point to the desired lattitude. The inside ring is used as the hour ring. In the middle you have the bridge which has a marker to adjust the month. In the middle of the marker is a small hole which the sunlight passes through to reveal a sun spot on the inside of the equatorial (hour) ring, which in turns gives you the time.

Unlike the 6cm astronomical ring which can be relied upon to measure the time fairly accurately as far as sundials are concerned, this model is best used as a decoration.

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Price per piece: €59.00 (including tax)