• KALA

One of the most popular reproductions it is also known as the Astronomical Ring. The concentric rings fold flat to slip into a pocket but open up to give a fully-working astronomical ring you can use as a hand-held sundial. A gift that will delight and amuse anyone with an enquiring mind.

• HEMISFERIUM

The Astrolabe was considered to be the mathematic jewel of the Middle Ages. Until the end of the 17th century it was the most-used instrument in the whole history of Astronomy. It is still useful today because it allows us to understand in a clear and simply way the apparent movement of the stars.

This miniature version in the form of a keyring has moving parts that allow it to be used for real. It makes a great talking point.

• HEMISFERIUM

Thought to originate with the arabs in the fourth century, the astrolabe became the most important astronomical instrument up to the end if the 17th century.

This miniaturised version works and makes a delightful decoration and talking point when displayed on its stand.

• HEMISFERIUM

Also known as a Mariner's Astrolabe this simplified version of the astrolabe was used to determine latitude by the stars. It makes a delightful keyring that is bound to cause interest.

• HEMISFERIUM

This piece is a reproduction of the Nautical Astrolabe of Dundee, so-called because it was owned by Andrew Smyton, a Dundee Skipper. The original was made by the Portuguese and can now be found in the Dundee Art Gallery and Museum. The nautical astrolabe is a simplifed astrolabe used to calculate latitude by measuring the positions of stars.

• HEMISFERIUM

This nocturnal watch is an astronomical instrument used to measure the time through the observation of the Pole Star and the position of bright stars in the celestial sphere.

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This piece is a reproduction of an instrument dated 1570 and signed by Humphrey Cole. The original can be found in the British Museum, London. It has two faces, one of which is this nocturnal which can be used to tell solar time at night.

• HEMISFERIUM

In 1573 Pedro Nunes invented an instrument that became known as the nautical ring dial, the astronomical dial or the graduated dial. It consists simply of a ring with a smaller ring inside that can be held vertically so that the rays of the sun shine through a hole to show the altitude of the sun.

A simple but attractive instrument that is fascinating and eductional. Please note that this model is now supplied with a fixed latitude setting of 50 degrees.

• HEMISFERIUM

The display version of the Nautical Ring Dial. This working model makes a useful conversation piece.

Please note that this model is now supplied with a fixed latitude setting of 50 degrees.

• HEMISFERIUM

This simple clock is similar in principal to astronomical rings or shepherd's sundials. It sacrifices precision for simplicity and ease of use.

An attractive pendant with a practical use.