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Mechanical barographs have a solid rotating brass drum that is driven by a quartz battery movement to rotate the drum once a week. A felt tip pen at the end of the writing arm shows changes in the air pressure on a paper diagram that is wrapped around the drum. A mechanical barometer movement with eight round diaphragms measure variation in the air pressure and transfers it very precisely through a system of mechanical levers to the writing arm. The models 2001, 2004 and 2006 have additional oil damping of the arm to avoid incorrect readings when on ships and yachts. All barographs come with a supply of charts and felt tip pens for one year.
Mahogany/ brass 8 diaphragms.
- Case: 300x170x180 mm
- Weight: 2650 g
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