Coffin's Winds of the Globe. 275 



the investigation of storms. For this the present work is not 

 available ; although the author appreciated this end, as shown 

 in his preparation of a previous work,* in which 300 pages are 

 devoted to selected records from 400 localities in the United 

 States, extending through several days each, in the case of 

 storms that occurred in March and September, 1859, and noting 

 not only the winds, but all the accompanying meteorological 

 phenomena. 



The method of summing and presenting this mass of^material, 

 is by five series : in each of which the separate seasons and 

 points of the compass are kept distinct, viz : 



I. The number of observations. 



II. The number of miles traveled, as estimated by the ob- 



III. The u 

 Then 



as indicated by the motion of the clouds. 



V. A velocity table computed from the first three series, the 

 results of which will be noted farther on. 



In series I, II and IV, the trigonometrical resultants are 

 computed, both as to direction and the ratio of the resultant 

 to the sum of the winds. Of these the work embraces 16,000 

 solutions, about one-half of which find place on the charts. 

 The deflecting forces have been wrought out in about 8,000 

 of these instances. 



The peculiarity of series V may be seen in an example. 

 Certain stations in New Hampshire, north of latitude 40°, 

 during the years 1854 to 1857 inclusive, give the following 





1 



I 

 ■2 



III 1 



JJJ 



Average velocity of all winds in miles, per hour,.. 

 Velocity in mean direction, on the supposition that 

 the winds from every point of the compass move 



2-72 1-07 



2-n! 3-82J 2-66 



ime velocity in mean direction, giving to the winds 

 from every point of the compass each their own 

 ^average velocity, as shown in the table above,.- 



2-91 



+ *s 





Let the 

 supposed to 

 after day 



an d general I 



States Senate Docu"ment736th tongremT' 



of a particle of air be traced, which is 

 1 only by the winds that are found day 

 ice : at the end of the year the path of the 



