440 



HENRY M. EAKIN 



generate F^, approximately equivalent in effectiveness to the deflect- 

 ive force operative under the same conditions at each fifth degree 

 of latitude. These figures are given in column 4, Table I. The 

 same velocity is assumed as in the former calculations. (In these 

 computations a symmetrical arrangement of velocities with respect 



TABLE I 



to a central maximum, decreasing directly with the distance from the 

 center to zero at the margins, has been assumed. This introduces 

 an error which gives a greater relative value to F^ and adds to the 

 value of the radii computed. This error varies with the actual 

 arrangement of velocities in the stream, but probably would never 

 amount to more than a small percentage.) 



Role of F^ among the Forces of Flow 



In studying the movements of water in a normal river we have to 

 do with three forces that are setting up and directing currents: Fg 

 acting down the general stream gradient, causing the primary current, 

 and F^ and Fj arising from this primary movement and acting always 

 at right angles to the direction of flow, F^ always toward the outer 

 bank on curves and F^ always to the right in the northern hemisphere, 

 to which the study will be confined in the following pages. 



