This paper presents some new methods of computing the sedimentation radius. The methods are founded on a curve for spheres, experimentally determined and constructed on the basis of the coefficient of resistance as a function of Reynolds number. When the validity of Stokes' law ceases, the sedimentation radius obtained by Stokes' formula is graphically corrected. The amount of deviation of Stokes' law from experimental data of higher Reynolds numbers has been statistically determined. Some new formulas for computing the resistance and the radius of a sphere of a given terminal settling velocity are presented.