Fischer 267M Mechanical Barograph for Ships

Fischer German 267M Mechanical Barograph for Ships Aneroid barograph used for the registration of atmospheric pressure with damped measuring mechanism for use at sea. Measuring range 955 to 1055 hPa Accuracy ± 0.7 hPa Diagram graduation 1 hPa. The measuring element in our barographs is a set of 7 aneroid capsules with a diameter of 62 mm. This set is manufactured of a copper-beryllium alloy which by its remarkable elastic composition has been tried and tested best for many years. Age-hardening, hysteresis and elastic after effects don`t occur practically. The influence of temperature on the set of aneroid capsules and the transmission system is compensated by a bimetal about the whole measuring range and for temperatures between -30 and +40°C (-22 ... 104 °F). All the axles of the precision instrument are supported in jewels because of this the instruments have only got a minimum of idle friction. Parts of the measuring mechanism are made of polished brass. Mahogany colored wooden