Barograph with case made of float glass with facet cut, brass, polished, damped Type: 265M

Aneroid barographs are used to continuously record atmospheric pressure. The measuring element is a set of seven diaphragm cells. It is made of a corrosion-resistant copper-beryllium alloy, which has proven itself for years to be an excellent choice for pressure measurement due to its excellent elastic properties. Aging, hysteresis, and elastic aftereffect are virtually nonexistent.
The barograph's measuring element is a set of seven diaphragm cells made of a copper-beryllium alloy, which has proven itself ideal for pressure measurement due to its excellent elastic properties. Aging, hysteresis, and elastic aftereffects are virtually nonexistent. The temperature influence on the set of cells and the transmission system is compensated by a bimetal element across the entire measuring range and within a temperature range of -30 to +40 °C. All axes of the precision mechanical measuring mechanism are mounted in stone, which ensures minimal static friction in the instrument.

The measuring mechanism components are made of polished brass. Mahogany-colored real wood case, dimensions: 345 x 190 x 185 mm.
Mechanical winding movement with daily and weekly rotation. The rotation periods are 25.6h / 176h.

Included in delivery are 60 weekly chart sheets and 2 fiber tip pens.
Barographs are particularly common on ships. Barographs also play a role in aviation, particularly gliding. In these cases, however, they are often referred to as altimeters.

The main features of the barograph are:
• 7-fold membrane can set
• Corrosion-resistant, elastic material
• good measurement accuracy (± 0.5 hPa)
• long-term stable
• temperature compensated
• switchable (1d - 7d) mechanical movement
• high reliability
• maintenance-free