
 SPHEROID  LoveToKnow Article on SPHEROID (Site not responding. Last check: 20071107) 
  The figure of the earth is frequently referred to as an oblate spheroid; this, however, is hardly correct, for the geoid has three unequal axes. 
  The Cartesian equation to a spheroid assumes the forms xi/ai~~~.(y2_j~.zi)/bf=1, for the prolate, and (x2+zf)lal+yl/b1 = 1, for the oblate, the origin being the centre and the coordinate axes the axes of the original ellipse, x2la?+yilb1 = I, and the line perpendicular to the plane containing them. 
  If drops of a liquid be placed on a highly heated surface, for example, the top of a stove, the liquid forms a number of tremulous globules which continually circulate internally. 
 19.1911encyclopedia.org /S/SP/SPHEROID.htm (330 words) 
