How do I use a portable sundial compass?

Open the hinged leaves of the diptych and align the string gnomon so that the shadow falls on the correct hour mark. The inset compass helps orient the instrument toward magnetic north before reading the time. Ensure the instrument rests on a flat surface during use. Many Georgian and Victorian pocket versions relied on precise levelling bubbles or plumb lines to maintain accuracy.

What is the difference between an octant and a sextant?

An octant measures angles up to ninety degrees using an arc that spans one-eighth of a circle. Sextants measure angles up to one hundred and twenty degrees using a sixth of a circle. Both instruments employ mirrors to bring the image of a celestial body down to the horizon, but sextants succeeded octants as the standard tool for ocean navigation.

How should I clean a brass navigation instrument?

Dust the surface gently with a soft dry cloth and avoid harsh chemical polishes that remove the historic patination. Preserving the original lacquered metal finish maintains the object's character. Wooden cases benefit from occasional treatment with appropriate wax to prevent the timber from drying out. Keep instruments away from direct sunlight and damp environments.

Why do some compasses have liquid inside?

Liquid-filled compasses dampen the movement of the needle, allowing it to settle quickly and remain steady while a ship pitches or rolls. Alcohol or water mixtures prevented freezing in cold climates. Dry card compasses rely on balance and jewel bearings instead, which were common in earlier pocket instruments and land-based travelling compasses.

How can I date an antique compass?

Examine the typography on the paper dial, the style of the needle, and the construction of the outer brass or wooden case. Maker signatures and patent marks often provide a reliable production window. Stylistic cues from Georgian, Victorian, and Edwardian design periods help narrow down the decade when the instrument was manufactured.

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These vintage navigation instruments are precision tools of brass, wood, and glass that seasoned travellers and sailors relied upon to find their way.

Legion D’honneur Presentation Marine Instruments by a Hurlimann Paris

1900 - 1920

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Legion D’honneur Presentation Marine Instruments by a Hurlimann Paris

From Jason Clarke Antiques

£5,000

FOR SALE

miscellaneous

1920 - 1940

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Thomas Mercer 2 Day Chronometer

From Finchingfield Antiques

£3,250

FOR SALE

clocks

Navisphère 8 Inch Celestial Globe, by Henri De Magnac

1900 - 1920

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Navisphère 8 Inch Celestial Globe, by Henri De Magnac

From Hatchwell Antiques

£2,800

FOR SALE

miscellaneous

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Vintage Navigation Instrument

Legion D’honneur Presentation Marine Instruments by a Hurlimann Paris

Thomas Mercer 2 Day Chronometer

Navisphère 8 Inch Celestial Globe, by Henri De Magnac

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