the Motion of Spheres through Liquids. 705 



with those obtained with the. colza oil. In fig. 4 it is seen 

 that the lower curve begins to rise at about r = 0'04. The 

 rate of departure from the straight line is very nearly the 

 same as in fig. 1. 



Fisr. 4. 



10 



0-9 

 0-3 

 0-7 

 0-6 



0-5 



<o 0-4- 



<o 

 ^0-3 



0-2 

 0-1 



Rose 



METAL IN 



Linseed oil 











jt, by Stokes leuv- - upper currc. 

 u. 6y ladenbery - louvrcurre.. 



















___, 























Vo^S*^ 

























































































•03 



■04 05 



' Radius /ai CM. 



•06 



07 



In working with oils of low viscosity it was necessary to 

 have spheres of less density than the Rose metal. For this 

 purpose some beeswax was melted in an alcohol-water mixture 

 whose density was slightly less than that of the cold wax. 

 The drops obtained by shaking the mixture cooled in very 

 perfect spherical shape and proved to be of fairly uniform 

 density. Their density was taken as that of an alcohol 

 mixture in which thev remained suspended, and was found 

 to be 0-9410 at 20°'0 C. 



Results obtained with these spheres in a transformer oil of 

 density 0'837, and of viscosity 0*070, are shown in fig. 5 

 (p. 766), The effect of the inertia terms becomes apparent at 

 r = 0*042 as in the previous cases. The discrepancies among 

 the observations in this case are easily accounted for by the 

 possible variations in the density of the different spheres, 

 since (cr — p) is only 0'113, and a variation of 0*1 per cent, 

 in density would make a difference of one per cent, in the 

 result. 



Phil Maq. S. 6. Vol. 22. No. 131. Xor. 1911. 3 E 



