What is the difference between terrestrial and astronomical types?

Terrestrial instruments include erecting lenses within the optical path so you view scenes upright and correctly oriented. This makes them suitable for maritime observation and landscape viewing. Astronomical versions omit the erecting lenses to gather maximum light for studying stars and planets. Images through an astronomical setup appear inverted, which does not affect celestial observation.

How should I clean the brass and mahogany?

Wipe the mahogany barrel gently with a dry or lightly oiled cloth to maintain the finish of the timber. Avoid harsh commercial polishes that can degrade aged wood surfaces. Clean the exposed brass using a soft cloth without abrasive cleaners, preserving the natural patina accumulated over the centuries. Leave optical glass untouched unless dust significantly impairs viewing.

Can I date a telescope from its signature?

Makers often engraved their business names, partnerships, and trading addresses onto the draw tubes. Cross-referencing these workshop directories establishes the active working window of the firm. Changes in address or partnership titles provide narrow date ranges for individual instruments. Unsigned pieces rely on mechanical style, materials, and case construction for dating.

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Mahogany Brass Telescope

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A mahogany brass telescope combines optical brass and turned timber into a portable instrument designed for maritime, terrestrial or astronomical use.

A Rare London Made Nine Sided 18thc Telescope

18th century

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A Rare London Made Nine Sided 18thc Telescope

From The Antique Partnership

£1,200

3+ MONTHS AGO

miscellaneous

Mid Eighteenth Century Non Achromatic Decagonal Reverse Taper Telescope by John Gilbert

18th century

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Mid Eighteenth Century Non Achromatic Decagonal Reverse Taper Telescope by John Gilbert

From Jason Clarke Antiques

£2,400

3+ MONTHS AGO

miscellaneous

19th century

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Architects Level by Wf Stanley 1892

From Wickersley Antiques

£220

3+ MONTHS AGO

miscellaneous

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Mahogany Brass Telescope

A Rare London Made Nine Sided 18thc Telescope

Mid Eighteenth Century Non Achromatic Decagonal Reverse Taper Telescope by John Gilbert

Architects Level by Wf Stanley 1892

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