How does a barograph work?

A stack of metal vacuum chambers expands and contracts as air pressure rises and falls. This movement transfers through brass levers to an arm holding an ink nib. The nib traces a continuous line onto a rotating paper chart secured around a clockwork drum. Each rotation typically covers the span of a single week.

Where should I place a barograph?

Position the instrument on a stable, level surface away from direct sunlight, radiators, and drafts. Sudden temperature changes can affect the internal mechanism. Because the case relies on glass panels for viewing, place the barograph where it receives adequate light without risk of accidental knocks.

How do I change the chart paper?

Lift the glass cover and gently secure the recording arm away from the drum. Remove the cylindrical drum by lifting it from its spindle. Wrap a fresh weekly chart around the metal cylinder, aligning the grid lines, and slide the drum back into position before lowering the nib.

How do I identify the period of a barograph?

Examine the timber used in the case and the style of the corner joints and mouldings. Oak and mahogany cases often reflect the prevailing domestic furniture styles of their decade of manufacture. Maker signatures or engraved presentation plaques on the brass bedplate provide further chronological markers for dating the instrument.

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Glass Cased Barograph

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A glass cased barograph is a recording barometer housed within protective glazing, offering a visual record of atmospheric pressure changes for your interior.

1900 - 1920

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A Five Glass Barograph

From Chalfont Clocks

£1,500

3+ MONTHS AGO

barometers

19th century

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French Victorian Atmos Barometer

From Jason Clarke Antiques

£1,750

3+ MONTHS AGO

barometers

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Glass Cased Barograph

A Five Glass Barograph

French Victorian Atmos Barometer

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