How do you transport a stick barometer safely?

Transporting these requires careful handling to keep air bubbles out of the mercury tube. You must slope the instrument slowly until the mercury hits the top of the glass. Keep it at a forty-five degree angle while moving. Carry it flat on its back if you must, but never upright and never upside down.

My grandfather left me a barometer with a tube that seems empty, so can it be refilled or is it ruined forever?

Empty tubes are a common issue when the mercury has leaked or been drained for storage. It is not ruined. Specialist restorers can clean the original glass and refill it with fresh mercury under vacuum conditions. The process requires specific workshop equipment to ensure no air gets trapped in the column.

Why is the mercury column curved at the top?

This curve is called the meniscus. Mercury does not wet the glass, so surface tension pulls it into a convex dome. You always read the pressure by aligning the vernier scale with the very top of this dome. If the dome flattens, the pressure is about to fall.

The silver dial on my hallway barometer has turned yellow and I can barely read the numbers, what is the best way to clean it at home?

You should not attempt to clean a tarnished register plate with liquid metal polishes. The silvering is merely a micro-thin layer of chemical paste on top of the brass. Rubbing it with household cleaners will strip the remaining silver layer off instantly. The plate needs professional re-silvering. A restorer will remove the old lacquer, rub in fresh silver chloride powder, and re-seal the surface with wax.

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Antique Stick Barometers from the 18th Century

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Antique stick barometers are tall, narrow scientific instruments designed to measure atmospheric pressure using a straight glass tube filled with mercury, typically mounted on a wooden backboard to hang flat against a wall.

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Antique Stick Barometers from the 18th Century

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