Taking the range of the barometer in Great Britain from 28 to 31 in., giving a difference of 3 in.
Iceland lies contiguous to that part of the north Atlantic in which the shifting areas of low pressure prevail, so that storms are frequent and the barometer is seldom firm.
He invented the wheel barometer, discussed the application of barometrical indications to meteorological forecasting, suggested a system of optical telegraphy, anticipated E.F.F.
6) consists of a barometer tube, containing mercury and standing in a bath of the same metal, surrounded by a vapour jacket.
This method was developed by Hofmann in 1868, who replaced the short tube of Gay-Lussac by an ordinary barometer tube, thus effecting the volatilization in a Torricellian vacuum.