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Encyclopedia > Barograph

A barograph is a recording aneroid barometer. It produces a paper chart recording the barometric pressure over time.

Barographs use one or more aneroid cells acting through a gear or lever train to drive a recording arm that has at its extreme end either a scribe or a pen. A scribe records on smoked foil while a pen records on paper. The recording material is mounted on a cylindrical drum which is rotated slowly by clockwork. Commonly, the drum makes one revolution per day, per week, or per month and the rotation rate can often be selected by the user.

Because the amount of movement that can be generated by a single aneroid is miniscule, up to seven aneroids are often stacked "in series" to amplify their motion.

Barographs are required by the FAI to record certain tasks and record attempts associated with sailplanes.

Nowadays, mechanical recording barographs have commonly been superseded by electronic weather instruments that use computer methods to record the barometric pressure. These are not only less expensive than mechanical barographs but they may also offer both greater recording length and the ability to perform further data analysis on the captured data including automated use of the data to forecast the weather.

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This German made barograph is housed in a mahogany case with glass sides and a polished brass handle for easy access.
The heart of this barograph is a stack of eight polished aneroid capsules, assuring outstanding sensitivity to even the smallest pressure fluctuations.
The Baltic Barograph # BA2003 is $ 1150.00 + $ 25.00 s/h.
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