[Illustration: 7. FULL GALE] [Illustration: 8. STORM] [Illustration: 9. HURRICANE SCALE OF WINDS ILLUSTRATED BY REDUCTION OF SAIL ON AMERICAN CLIPPER SHIPS. _Note._-- This is a combined scale with average wind velocities as follows:--(0) CALM;--(1) 2 miles an hour;--(2) 7 miles an hour;--(3) 11 miles an hour;--(4) 16 miles an hour;--(5) 22 miles an hour;--(6) 27 miles an hour;--(7) 32 miles an hour;--(8) 45 miles an hour;--(9) 60 miles an hour or more.] [Illustration: BRANCH LIGHTNING. _Copyright by H. E. Clark, Indianapolis. Courtesy of U.S. Weather Bureau._] [Illustration: MULTIPLE FLASH. _Courtesy of General Electric Co., Schenectady, N. Y._] [Illustration: EIFFEL TOWER STRUCK BY LIGHTNING. Unusual example of attraction of electric discharge. This great structure in Paris is struck in almost every thunderstorm.] [Illustration: LIGHTNING FLASH STRIKING BUILDING. Single disruptive discharge of great intensity, at Greensboro, N.C. This non-branched form is rare. _Courtesy of Gen. Electric Co., Schenectady, N. Y._] [Illustration: CARRIED IN THE AIR THREE MILES FROM THEIR STABLE.] [Illustration: GRAND PIANO PICKED UP BY A TORNADO AND DROPPED IN A COW-PASTURE. _Courtesy of T. B. Jennings, U.S. Weather Bureau, Topeka, Kans._]