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 measures variation in the air pressure and transfers it very precisely through a system of mechanical levers to the writing arm. The high-quality mahogany case is polished several times and treated with a special high-gloss lacquer to produce an especially lustrous surface. The interior metal parts are solid brass, polished and gold-plated.
Come with a supply of charts and felt tip pens for one year.
Case: 195 x 125 x 127mm
Requires a 1.5V AA LR6 Battery - not included
Delivery from £5.95For this item shipped on it's own