Pfeiffer Wetzlar Dasymeter
A Pfeiffer Wetzlar Dasymeter or baroscop to measure the Buoyancy of Air or the weight of air. A small balance supporting a glass bulb and a small weight on two sides of an arm. When placed in a evacuated bell jar the glass bulb appears heavier due to its greater loss of buoyancy.
On top a pointer and scale. The balance arises from a lacquered brass stand. The stem is inscribed by its manufacturer A Pfeiffer Wetzlar. The company Pfeiffer Vacuum Technology AG is a German manufacturer of vacuum pumps which was founded in 1890. A similar dasymeter is included in the Max Kohl catalogue of 1912 and therefor this dasymeter can be dated about that age.
Dimensions: 19 x 14,5 x 7 cm