Why has the ink stopped flowing?

The most frequent cause is dried residue blocking the nib. Historic recording inks evaporate slowly and leave a solid deposit in the narrow channel. You can usually soak the metal nib in warm water to clear the blockage. Some dealers use a fine pin to gently open the split.

Where do you buy replacement charts?

Specialist horological suppliers still print weekly charts. Measure the height of your brass cylinder first. Then match the pressure scale, whether inches of mercury or millibars, to your specific instrument.

I wound up the drum yesterday but the paper hasn't moved around at all, so is the clockwork broken or am I doing something wrong?

The drum might be slipping on its central spindle. Most designs feature a knurled nut on top of the cylinder that needs tightening to engage the clock drive. If the nut is tight, the internal movement could be jammed with old grease. Clockwork mechanisms require occasional cleaning and re-oiling by a specialist to maintain torque.

There is a little metal bottle sitting in a bracket in the corner of the wooden base, but what kind of fluid belongs in it?

That bracket holds the original ink bottle. The fluid was a specialist slow-drying glycerin ink mixed specifically for meteorological recording instruments. Standard fountain pen ink dries out too quickly on the exposed nib. Modern equivalents of the original recipe are readily available from weather instrument restorers.

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Antique barographs are clockwork instruments housed in glazed wooden cases that record atmospheric pressure by tracing an ink line onto a rotating paper chart.

1900 - 1920

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Barograph

From Midwinter Antiques

£795

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barometers

19th century

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French Victorian Atmos Barometer

From Jason Clarke Antiques

£1,750

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barometers

Superb Quality Antique Mahogany Negretti & Zambra Aneroid Barometer

19th century

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Superb Quality Antique Mahogany Negretti & Zambra Aneroid Barometer

From David Wolfenden Antiques

£975

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Victorian Barographs

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French Victorian Atmos Barometer

Superb Quality Antique Mahogany Negretti & Zambra Aneroid Barometer

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