SEKIES F.— EFFECT OF FORCE AND VELOCITY. 



185 



The modifications occasioned by introducing the element of force, or velocity, 

 may perhaps be more clearly seen in the following table, which is deduced from the 

 preceding one, and shows the difference of the resultants, both in direction and 

 amount, from what they are when computed from time only. In the columns 

 headed "Difference in Direction of Resultant," the sign + denotes that the direc- 

 tion is farther to the right than it would be if computed from time only, and the 

 sign — , that it is farther to the left. In those headed " Difference per cent, in 

 Amount of Resultant," the sign + denotes that it is greater than if computed from 

 time only, and the sign — , that it is less. 



Place of observation. 



Difference in direction of 

 resultant. 



Difference in 

 of resultant. 



Force. 



Boothia Felix ....... 



Toronto (by anemometer) ..... 



Do. (by estimation) ...... 



Southern Maine, New Hampshire, and Vermont . 

 Cambridge, Massachusetts ..... 



Williams College, Do. ..... 



Massachusetts, Rhode Island, and Connecticut 



New York State 



New Jersey and Pennsylvania .... 



Girard College, Pennsylvania (1843) . 

 Do. do. (1844) . 



Delaware, Maryland, and Eastern Virginia . 

 North Carolina ....... 



Savannah, Georgia ...... 



Georgia, Alabama, Mississippi, and Northern Florida 

 Tennessee and Kentucky ..... 



Ohio 



Athens, Illinois ...... 



Indiana, Illinois, Michigan, Wisconsin, and Iowa . 

 Porto Cabello, Venezuela ..... 



Pouce, Porto Rico ...... 



Turk's Island, Bahamas . . ... 



Bermudas ........ 



Inchkeith, Scotland ...... 



Calton Hill, do. ...... 



Sturbington, England ..... 



Greenwich, do. ...... 



Devonport, do. ..... . 



Oporto, Portugal ...... 



Tripoli, Barbary ...... 



+ 8° 0' 

 — 31 30 



+ 16 



— 1 52 



— 35 



— 2 21 

 + 11 56 



7 

 23 



56 

 7 



30 

 1 



+ 27 



— 4 

 + 17 46 



— 16 3 



— 5 

 + 

 + 5 

 + 4 

 + 6 47 



— 17 24 

 + 12 44 

 + 1 17 

 + 38 30 



— 7 36 



— 22 45 

 + 17 41 

 + 10 7 



— 24° 6' 

 + 8 43 

 + 8 20 



— 1 18 



— 12 29 

 + 53 

 + 14 38 



— 10 39 



+ 3 16 



— 53 

 45 

 4 



+ 8 

 + 9 

 + 18 14 

 — 19 1 



+ 21 7 



+ 26 47 



+ 62 

 + 350 

 + 100 

 + 15 



+ 



7 



+ 3 



+ 4 



+ Hi 



+ 20 



+ 86 



+ 37J 



+ 70 

 



— 4 

 + 15 

 + 13 

 + 13 



— U 

 + 30 



2* 



9 



16i 



+ 57i 



+ 56 



— 4^- 



+ 15 



+ 176 

 + 78 

 + 14 



+ 4 



+ 24^ 



+ 20 



+ 46 



+ 91 



— 11 



+ 191 



+ 21 



+ 18 



- Ill 



+ 37i 



+ 80 



+ 97 



+ 14 



+ 4 



+ 33 



— 3J 



In the series of wind-roses on Plate XIII., the width of the shading, in different 

 parts of the circumference, is proportional to the average force of the winds from 

 those directions, as given in Series E. The arrows exhibit to the eye the direction 

 and amount of most of the resultants contained in Series F, No. 1 being that for 

 time, No. 2 for force, and No. 3 for distance. 



An inspection of the foregoing tables and plate shows very clearly that, as a 

 general thing, the difference in tlie velocity of the winds from different points of com- 

 pass affects the resultant but slightly, either in direction or amount. This is 

 especially true, when observations, taken at a considerable number of stations, are 

 combined, so as to neutralize the effect of local influences, to which almost every 



