. Undulations of Barometric Pressure moving 30 to 40 miles an hour to the North-Eastward, with their accompanying Winds. We have, then, two important facts: 1. By consulting Buchan's Isobars, we ^nd that during the winter months the normal state of pressure is high over the land on each side, and low over the sea in the central part of the Atlantic, also that the pressure gets lower as you go North from the Azores. Let the line A B C in the diagram above be supposed to represent a section of the normal state of pressure across the Atlantic, with a lower pressure to the North than to the South
. Undulations of Barometric Pressure moving 30 to 40 miles an hour to the North-Eastward, with their accompanying Winds. We have, then, two important facts: 1. By consulting Buchan's Isobars, we ^nd that during the winter months the normal state of pressure is high over the land on each side, and low over the sea in the central part of the Atlantic, also that the pressure gets lower as you go North from the Azores. Let the line A B C in the diagram above be supposed to represent a section of the normal state of pressure across the Atlantic, with a lower pressure to the North than to the South of it, then the arrows may be supposed to represent the normal direction of the wind. 2. Besides this normal state, we have, as it were, the crests and hollows of waves of pressure moving to the North-Eastward. These (the diagrams N. A. 0 26
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