How do stick barometers work?

A stick barometer balances the weight of a mercury column against atmospheric pressure acting on an exposed reservoir. When pressure increases, the mercury is pushed higher up the vertical glass tube. Changes in weather correspond directly to the height of this column, allowing observers to track incoming atmospheric shifts by reading the calibrated scale.

Where should I hang a wall barometer?

These instruments require placement on an interior wall away from direct sunlight, central heating radiators, and drafts. Stable ambient temperatures ensure the internal mechanism functions accurately. Securing the heavy timber case to a solid wall stud using appropriate fixings protects the delicate glass tubes and wooden framing from accidental impact.

What is an aneroid barometer?

An aneroid barometer measures atmospheric pressure using a sealed, flexible metal capsule that expands or contracts as pressure alters. A system of levers connects this capsule to the indicator needle on the dial. This design avoids liquid mercury, making the instrument robust and suitable for a wider variety of wall-mounted domestic and marine cases.

How do I date a barometer?

Dating relies on the casing style, the materials used, and the signature of the maker engraved on the metal plate. Georgian examples often feature understated mahogany or rosewood stick cases with vernier scales. Victorian pieces frequently display heavier carved oak or walnut frames, ornate dials, and diverse mechanisms like the Fitzroy storm barometer or aneroid movements.