A Steady Barometer.
With dry air and seasonable temperature, indicates a continuance of very fine weather.
A Falling Barometer.
A “rapid” fall indicates stormy weather.
A “rapid” fall, with westerly wind, indicates stormy weather from Northward.
A “fall,” with a northerly wind, indicates storm, with rain and hail in summer, and snow in winter.
A “fall,” with increased moisture in the air, and the heat increasing, indicates wind and rain from Southward.
A “fall” with dry air and cold increasing (in winter) indicates snow.
A “fall” after very calm and warm weather indicates rain with squally weather.
It does not require the highest quality in the mechanism of an Aneroid to serve the purpose indicated in the above rules.