What period do most barographs date from?

The dated listings run from 1870 to 1950 and nothing falls outside that. The weight is on one generation: the 1910s, 1900s and 1920s together hold eighty of the dated pieces. Earlier examples are scarce in this corner, with only three in the 1870s. Seventeen more are filed simply as Edwardian, which puts them in the same bracket.

Why does the case wood get mentioned first?

Because it's how the trade identifies these instruments. Oak, mahogany and walnut between them account for ninety-one of the hundred and forty-five titles, and "cased" appears in a third of them. Oak leads on numbers, with mahogany close behind and walnut a smaller group. Figured walnut and inlaid mahogany cases sit higher in the range than plain oak.

What does five-glass mean on a barograph?

It describes a case glazed on five faces, so the drum and movement can be read from any side rather than just the front. They're uncommon, turning up in about one title in twelve, though they make up a larger share of what's currently listed. Every explicitly five-glass example sits at the top of the range.

Are combined barograph and barometer instruments common?

They're a recognisable minority rather than the norm. Around a dozen listings pair the recording drum with a barometer or aneroid dial on the case front or in the lid. Eight add a thermometer, and two go further and record temperature as thermographs. Whichever form it takes, a second reading device tends to place a piece above the mid-range.

How many barographs come up for sale?

About sixteen a year on Sellingantiques, spread across twenty-six different dealers. A steady trickle rather than a flood. The archive stands at a hundred and forty-five listings in total, which makes it a small but well documented category.

Do unusual barographs turn up, or just table models?

The glazed wooden table instrument dominates, but oddities appear one at a time: a gilt brass barograph, a brass-and-nickel-plated case, a miniature, and a wall-mounted example with its own bracket. There are also portable types and open-scale micro barographs. Continental instruments from France and Germany make up under a tenth of the archive.

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Antique Barographs

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A barograph is a clockwork recording barometer: aneroid capsules drive an inked arm across a paper chart on a turning drum, giving a continuous written trace of atmospheric pressure instead of a single reading.