342 



On Currents in Water. 



to 



Suppose it possible to project a body due north from the equator, 

 reach the sixtieth de^a-ee of north latitude in one hour. 



Fig. 1. 



N 



W 



E 



S 



EW 



and NS a meridian, on 



which a body i°s projected from A, to reach B, in the sixtieth degree 

 of north latitude, in one hour, in which time the point A would be 



J 



VIZ 



carried to C, fifteen degrees eastwardly. Now, according to the 

 law respecting forces, the body thus impelled in two directions 

 towards B and C, would not move in a direction towards either, but 

 upon the diagonal line AD between them, arriving at the latitude o 

 sixty degrees north, at the distance of thirty degrees of longitu e 

 eastwardly from the meridian upon which it was projected, equa o 

 fifteen degrees of longitude measured upon the equator. In tins ca 

 culation no allowances are made for resistances ; it is only use 



ted 



show that bodies passing northwardly or southwardly are dene 

 from their course by the motion of the earth upon its axis. _ 



Upon the same principles, it may be shown, that a body P''^^^^ 

 from the north pole towards the equator, would arrive at the a e^ 

 place upon the westerly side of the meridian upon which it was p 



jected. 

 Till. 



about 



volv^ 



«^^v i.o UClllCl, VVUCU UJ lulling a Mcxxi ^^.^. -— _ ^. 



ence towards the center, it will be found to pass forward in m 



