•►F, 



Figure 19. Schematic illustration of apparent gravity. The force ¥„ is 

 everywhere directed toward the center of the Earth, and is 

 nearly constant in magnitude; Fg is parallel to the equatorial 

 plane and decreases from a maximum at the Equator to zero at 

 the poles. The resultant, Fag, illustrated for only near the 

 middle of the first quadrant, is directed toward a point in the 

 equatorial plane removed from the center of the Earth. 



Figure 20. Equipotential or "level" surfaces (from Feldscher and Berry, 1968). 



