Sextant with artificial horizon by Hurlimann Ponthus & Therrode

Sextant with artificial horizon

Hurlimann Ponthus & Therrode

Fine art poster

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  • Amazing giclée print quality
  • 280gsm thick fine art print paper
  • 100+ year colour guarantee
  • Dimensions:
    • x cm including border ( x in)
    • 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.

Sextant with artificial horizon by Hurlimann Ponthus & Therrode zoom

Sextant with artificial horizon

Black-lacquered brass frame, wooden handle, and a hollow tube at the back of the frame for a stand. Signed on the limb 'Hurlimann, Ponthus & Therrode, ÔòáÔò® Paris (2975)', and on the artificial horizon 'Ponthus & Therode Paris'. Bronzed limb with inlaid silver scale from -5 to 130 by 20', measuring to 108. Silver vernier to 10'', zero right. Index glass (large) and horizon glass (large with hole in the centre) adjustment by detached key (missing). Three index shades (red, green, orange), two horizon shades (both orange), on the outside of the artificial horizon. Double ended tangent screw on front of the index arm, clamp screw on the back. Magnifier (single lens) on 70 mm swivelling arm, frosted glass shade. Telescope bracket without adjustment. Telescope (10 mm) erect image, with wide objective lens (star finder). Radius 5,5'' (143 mm). Box missing.

The artificial horizon consists of an airtight housing containing a gyroscope that can be locked with a lever mechanism. The gyroscope has a glass through the body, with a series of horizontal lines. The gyroscope is propelled by an air pump (missing). Air gauge calibrated from 0-76 cm of mercury.

This is the improved Admiral Fleuriais (1840-1895) artificial horizon.

There is an earlier version of the gyroscopic horizon in the collection, ACO1514.
Hurlimann Ponthus & Therrode

  • Image reference: F5165-001

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