xxxu 



INTRODUCTION. 



Also 



F, = 



13713 

 pd sin (j) 

 1.8284 

 pd sin 4> 

 64552 



(IV) 



(V) 



(VI) 



and Rr. = 



18.806 

 pf/sin^0 



25-073 

 pc^ sin- 



24-5QO 

 _ pd sm^({> 



Units of 

 pressure. 



(VII) (Millibars) 

 (VIII) (Millimeters) 

 (IX) (Inches) 



Radius of critical curvature and velocities of gradient winds for frictionless 

 motion in Highs and Lows. 



Table 40. English Measures. tables 40, 41. 



Table 41 . Metric Measures. 



These tables give the radius of curvature of the critical isobar in anti- 

 cyclones, computed from the equation 



pco " sm^ 

 the velocity of the wind on this isobar, computed from the equation 



pco sm (f) 

 the velocity of the wind on a straight isobar, computed from the equation 



V. = 



AP 



= - V 

 2 



and 



2 pco sm </) 



the velocity of the wind in a cyclone having the same gradient as the anti- 

 cyclone, and on an isobar having a radius of curvature equal to R^, com- 

 puted from the equation 



Fi = V, (\/^ - i) - 0.414 V, 



Table 40, English measures, gives values of R^, in miles, and of F^ 

 High, Vs, and V Low, in miles per hour. The side argument is the latitude 

 for 10°, and at 5° intervals from 20° to 90°, inclusive. The top argument, 

 d, is the perpendicular distance in miles between isobars drawn for pressure 



intervals of ^ inch. For values of d one tenth as great as given in the 

 10 



heading of the table the values of Re, Vc High, F^, and F Low are increased 



tenfold. 



Table 41, metric measures, gives values of Re in kilometers, and of 



Vc High, Vs, and V Low, in meters per second. The side argument is the 



same as in Table 40. The top argument, d, is the perpendicular distance 



in kilometers between isobars drawn for pressure intervals of i millimeter. 



For values of d one tenth as great as given in the heading of the table the 



values of Re, Vc High, Vs, and F Low are increased tenfold. 



