194 



SCIEJNUE 



SHORT CHAPTERS. 



WEATHER CHART, OCTOBER 5, 1875. 



EXPLANATION OF WEATHER CHART. 



In these charts the state of the sea whether "rough," "smooth," "moderate," 

 "slight," etc., is marked in capital letters; and the state of the weather as "clear," 

 "dull," "cloudy," "showery," etc., in small letters. The direction of the wind is 

 indicated by the arrow. Unlike the arrows of a vane, these do not point toward 

 the direction from which the wind is coming, hut are flying arrows represented as 

 moving with the wind, and consequently pointing to where the wind is going. The 

 force of the wind is represented in five degrees of strength. 1st. A calm, by a hori- 

 zontal line and zero thus ; 2d. A light wind, by an arrow with one barb and no 



