PATHS OF MOVING PARTICLES SPRUNG 



63 



pie, convince ourselves that for the same relative velocity v the 

 circle has always the same magnitude whether it passes through the 

 point of rotation M or at a greater distance from it. 7 There is no 

 tendency on the part of the moving body to remain in a circle of 

 latitude or to move parallel to the latitude circles as assumed in the 

 theories of Hadley and Dove; for every azimuth of the motion the 



FIG. 2 



tendency is precisely the same, that is, to deviate toward the right 

 from the momentary current direction of motion. 



Let us now try to follow the above construction analytically. 



7 By the aid of a ball of chalk rolling about on a rotating parabolic-shaped 

 blackboard an autographic representation of these inertia paths can be 

 reproduced; the unavoidable friction will only be manifest in this, that 

 the curves (approximately circular) become gradually narrower and nar- 

 rower. I recommend the following as suitable dimensions for this appa- 

 ratus: diameter of the parabolic shell, 120 cm.; depth in the middle, 10 cm. 

 In this case the time of revolution, T, must be 2.7 seconds. 



