How do I read a marine barometer?

Marine barometers indicate changes in atmospheric pressure through a moving needle on a graduated dial or a mercury column in a glass tube. Higher readings generally correspond to settled weather, while falling pressure signals approaching storms. Historical barometers often include vernier scales for precise readings. Observers adjusted a manually set index pointer to track whether pressure rose or fell since the last check.

Were these instruments used at sea?

Many of these pieces served practical duties aboard naval vessels, merchant ships, and exploration expeditions. Telescopes and compasses faced harsh maritime conditions, which explains the durable brass and leather construction. Other items, such as tabletop barographs and library compasses, remained in shore-based offices or observatories. Their design reflected the same precision engineering required for oceanic navigation.

How do I date a brass telescope?

The number of draws provides an initial indication of date, alongside the materials used for the barrel and lens housing. Engraved signatures identifying the maker and their business address help narrow the production decade. Stylistic shifts in the typeface and the inclusion of protective leather casing also assist in dating. Georgian instruments often display simpler lines, while late Victorian examples incorporate more complex adjustments.

How should I maintain brass instruments?

Keep brass instruments away from damp environments to prevent corrosion and verdigris from forming on the metal surfaces. Dust lenses gently with a soft brush rather than liquid cleaners to preserve optical coatings. Store wooden cases and leather-dressed spyglasses in stable temperatures to avoid warping or cracking. Periodically check mechanical joints to ensure smooth movement without forcing stuck threads.

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Maritime Scientific Instruments

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Maritime scientific instruments are precision tools designed for navigation and measurement at sea, prized by collectors for their intricate engineering and historical craftsmanship.

Antique Explorer’s Telescope, English, Leather Dressed Spyglass, Edwardian, 1910

1900 - 1920

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Antique Explorer’s Telescope, English, Leather Dressed Spyglass, Edwardian, 1910

From London Fine Antiques

£895

3+ MONTHS AGO

miscellaneous

19th century

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Cased Telescope

From D J Green Antiques

£195

3+ MONTHS AGO

miscellaneous

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

3+ MONTHS AGO

miscellaneous

19th century

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A Large Desk Compass

From The Antique Partnership

£475

3+ MONTHS AGO

miscellaneous

Antique 3 Draw Telescope, English Brass, Leather, Newton & Co, Victorian, C.1870

19th century

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Antique 3 Draw Telescope, English Brass, Leather, Newton & Co, Victorian, C.1870

From London Fine Antiques

£1,275

3+ MONTHS AGO

miscellaneous

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

3+ MONTHS AGO

miscellaneous

19th century

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An Antique Explorer's Compass

From Opus Antiques

£190

3+ MONTHS AGO

miscellaneous

18th century

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A Telescope by Cary London

From The Antique Partnership

£450

3+ MONTHS AGO

miscellaneous

Antique English Mahogany Cased Compass by Stanley, London

19th century

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Antique English Mahogany Cased Compass by Stanley, London

From Puckerings

£295

3+ MONTHS AGO

miscellaneous

George III Mahogany Cased Wall Thermometer by Cox of Plymouth Dock

19th century

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George III Mahogany Cased Wall Thermometer by Cox of Plymouth Dock

From Jason Clarke Antiques

£1,250

3+ MONTHS AGO

miscellaneous

Listings feature scientific instruments spanning the Georgian, Victorian, and Edwardian periods, constructed from brass, mahogany, leather, and glass.

19th century

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Nice Ships Barometer

From Samuel Orr Antique Clocks

£3,000

3+ MONTHS AGO

barometers

A Pair of Edwardian Industrial Water Pressure Gauges

1900 - 1920

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A Pair of Edwardian Industrial Water Pressure Gauges

From Culvertons

£385

3+ MONTHS AGO

miscellaneous

19th century

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Negretti & Zambra Theodolite

From Shackladys Antiques

£875

3+ MONTHS AGO

miscellaneous

Lovely Early Brass 4 Draw Telescope by L. Casella, London.

1900 - 1920

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Lovely Early Brass 4 Draw Telescope by L. Casella, London.

From The Dorking Desk Shop

£375

3+ MONTHS AGO

miscellaneous

19th century

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A Regency London Made Pocket Telescope

From The Antique Partnership

£395

3+ MONTHS AGO

miscellaneous

Mid Victorian Aneroid Barometer by M Pillischer of Bond Street, London

19th century

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Mid Victorian Aneroid Barometer by M Pillischer of Bond Street, London

From Jason Clarke Antiques

£475

3+ MONTHS AGO

barometers

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Maritime Scientific Instruments

Antique Explorer’s Telescope, English, Leather Dressed Spyglass, Edwardian, 1910

Cased Telescope

Navisphère 8 Inch Celestial Globe, by Henri De Magnac

A Large Desk Compass

Antique 3 Draw Telescope, English Brass, Leather, Newton & Co, Victorian, C.1870

Legion D’honneur Presentation Marine Instruments by a Hurlimann Paris

An Antique Explorer's Compass

A Telescope by Cary London

Antique English Mahogany Cased Compass by Stanley, London

George III Mahogany Cased Wall Thermometer by Cox of Plymouth Dock

Nice Ships Barometer

A Pair of Edwardian Industrial Water Pressure Gauges

Negretti & Zambra Theodolite

Lovely Early Brass 4 Draw Telescope by L. Casella, London.

A Regency London Made Pocket Telescope

Mid Victorian Aneroid Barometer by M Pillischer of Bond Street, London

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