National Geographic : 1905 Jun
2029.2 4 9.ga 1 C1z Black lines connect places having equal barometric c5 pressure; red lines connect places having equal tempera- . ture; arrows point in direction wind is blowing; figures ,: ) 6 at end of arrows show wind velocity, when it is more ,---60 than light. O clear; a partly cloudy; O cloudy; R rain; S snow. HIGH indicates center of anticyclone, or high-pressure I area; LOW indicates center of cyclone, or low-pressure area. Large figures show average temperature in each quad rant of cyclone. Shading shows precipitation area of last 24 hours. 30.4 O0 Blac lins cnnec plaes avin equl bromeric '3 50° Shading shows precipitation area of last 24 hours. CHART VI.-Cold Wave, January 9, 1886, 7 A. M.