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Barometer (detail)

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probably made in Edinburgh

Barometer (detail)
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This is a detail of the glass tube of a special barometer without mercury, also known as a sympiesometer. The sympiesometer was patented by the Edinburgh instrument maker Alexander Adie (1775-1858) in 1818. This example was produced by the same firm, Adie & Son, probably around 1880. It still contains its original tube which is numbered 2310, as is the instrument.

This detail shows the number '2310' scratched into the glass tube.

Instruments were not at this time mass-produced in the way that, for example, large pieces of machinery could be. They were made in small batches, and each part was then crafted to fit exactly. Thus parts for a particular instrument had to be numbered, to prevent confusion during assembly. It is unusual for a glass part to have survived so long.

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