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"The inner circle incloses a map upon which the horizontal direction of the lower currents is shown by unbroken arrows, and that of the upper currents by broken arrows. The map is surrounded by a vertical section of the atmosphere in which the up-and-down are also shown by arrows. Near the equator the air rises and moves westward, and near the tropics it moves eastward and descends." -Dryer, 1901

Atmospheric Circulation

"The inner circle incloses a map upon which the horizontal direction of the lower currents is shown…

"If the cyclones and anticyclones all pursued the same path at regular intervals, the result would be shown" here." -Dryer, 1901

Cyclones and Anticyclones

"If the cyclones and anticyclones all pursued the same path at regular intervals, the result would be…