THE DISPLACEMENT IN A CASE OF FLUID MOTION. 



213 



I then laid Fig. 1 on Fig. 2, and drew, through the intersections of the 

 stream-lines and the paths of the corresponding particles in the fluid originally 





FIG. 2. 

 Paths of particles of the fluid -when a cylinder moves through it. 



Fio. 3. 

 Paths of particles at different distances from the cylinder: radius of cylinder, 5 inch. At great 



distances (ft) the path is a circle of radius ; and in this circle tan s = -^. 



*P 2 P 



