·noun An instrument for determining the weight or pressure of the atmosphere, and hence for judging of the probable changes of weather, or for ascertaining the height of any ascent.
A glass tube of 36 inches in length, filled with the open end upwards with refined mercury thus boil...
The Sailor's Word-Book
·- A barometer in which the changes of atmospheric pressure are indicated by the motion of a column ...
Webster's Dictionary of the English Language
A barometer, the tube of which is contracted in one part to prevent the sudden oscillations of the m...
See sympiesometer ...
A term reckoned synonymous with par-line (which see). ...