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"Isobars, isotherms, and winds at various altitudes in a cyclone." -Waldo, 1896

Isobars and Isotherms

"Isobars, isotherms, and winds at various altitudes in a cyclone." -Waldo, 1896

"Isobars, isotherms, and winds at various altitudes in a cyclone." -Waldo, 1896

Isobars and Isotherms

"Isobars, isotherms, and winds at various altitudes in a cyclone." -Waldo, 1896

"In meteorology, a subsidiary cyclonic circulation, generally on the border of a primary cyclone accompanied by rain, thunder-storms, and squalls: indicated on a weather-map by the bulging of a sea-level isobar toward the region of higher pressure." -Whitney, 1911

Secondary

"In meteorology, a subsidiary cyclonic circulation, generally on the border of a primary cyclone accompanied…