Experiments on aneroid barometers at Kew observatory and their discussion

The paper deals with two species of data. The first consists of articulars derived from the records at Kew Observatory as to errors observed in about 300 aneroid barometers. These had been objected to the ordinary Kew test, which consists in lowering the ressure to which the aneroid is exposed inch by inch to the lowest oint at which verification is desired, and raising the pressure in a corresponding way to its original value.