How do aneroid barometers work?

An aneroid barometer contains a sealed corrugated metal box that expands or contracts as atmospheric pressure fluctuates outside. A system of delicate levers and springs translates this movement into the rotation of the pointer across the dial face. Because no liquid mercury is involved, these instruments are safe to move and hang in various orientations around a room. The inclusion of a thermometer or hygrometer in the same case provides a complete atmospheric reading.

A barograph is a recording barometer that continuously charts air pressure onto a paper chart fixed to a clockwork drum. The mechanical arm holds an ink nib that traces the daily meteorological trends. Housed in glass and mahogany cases, these mechanical devices require regular winding of the internal clockwork cylinder to maintain their continuous recording function.

How do I date an instrument?

Dating relies on the stylistic cues of the timber case, the typography upon the silvered dial, and the mechanical signature of the maker. Victorian examples often display heavy oak carving or ebonised surrounds, while Edwardian pieces lean toward cleaner mahogany housing. Makers frequently changed their trading addresses or partnership names over decades, allowing researchers to narrow the production window based on the text engraved on the instrument face.

Where should I hang a wall barometer?

A wall barometer requires a stable interior partition away from direct heat sources, strong drafts, and excessive moisture to protect the timber case and internal brass mechanism. Secure wall fixings are essential given the substantial weight of models cased in carved oak or multi-glass mahogany. Placement at eye level ensures clear reading of the silvered dial and allows easy access for periodic setting against known weather conditions using the adjustment screw.

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These london aneroid barometer pieces measure atmospheric pressure through mechanical expansion, offering both scientific utility and classic interior decoration.

Barograph. In a 5-Glass Mahogany Case and Retailed by Harrods of London.
circa: Early 20th Century.

1900 - 1920

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Barograph. In a 5-Glass Mahogany Case and Retailed by Harrods of London. circa: Early 20th Century.

From M. C. Taylor

£2,150

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London Aneroid Barometer

Barograph. In a 5-Glass Mahogany Case and Retailed by Harrods of London. circa: Early 20th Century.

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