270 G - F - McBwen. 



spond to the conditions in a section included between two stream-lines, 

 and the method described on page (259) will give the value of (T), the 

 actual temperature near the coast, if the mean value of the normal 

 temperature were used for (t%). 



Thus it would be possible to obtain the value of (T) from the 

 section that started where (T) was desired, and the temperature of an 

 area running east and west could be found from the temperatures of 

 the inclined sections that cross it. 



Now consider two of these inclined sections, one terminating at the 

 outer boundary of the east and west area, and the other beginning at 

 its inner boundary. Assume the outer boundaries of the three areas to be por- 

 tions of a line parallel to the coast, then if the breadths of these areas mea- 

 sured parallel to this line are equal, the areas will be equal, the mean 

 temperature of the middle area will be approximately the average of 

 the temperatures of the inclined sections, the mean wind velocity over 

 the middle area will be approximately the average of the wind velo- 

 cities over the inclined sections. Therefore if the normal temperature 

 of the east and west area is assumed to be reduced only by the in- 

 trusion of bottom water underneath it whose amount is computed as 

 on page (259), where the wind velocity corresponding to that latitude is 

 used, the result would be approximately the same as the more com- 

 plicated but pertinent method just explained. 



Also the distance (x -f- x 2 ) is multiplied by the perpendicular 

 distance between the bounding lines of the east and west surface to 

 obtain the area, but the distance (x) should be multiplied by the length 

 of the coast included by these bounding lines, since it is the quantity 

 flowing normal to the coast that is assumed to enter the first area. 

 Therefore the numerator of equation (13) and also of (22) should be 

 divided by (cos a) where (a) is the angle the coast makes with a north 



and south line, and consequently the denominator (xi + yXa) deter- 

 mined as on page (259) would be increased in the same proportion. 

 Thus the use of formula (22) for computing temperatures is justified, 



but we must divide the quantity (xi + ijj-Xa) determined as on page 



(259), by (cos a) in order to obtain the correct distance out to where 

 the temperature is the average of (T) and (1%) for the latitude. And if 

 another relation between (x ) and (x 2 ) can be found, then we can cal- 

 culate (x 1 -f-x 2 ) the distance west to where the cooling effect is prac- 

 tically negligible. 



