Drag of water upon water at Low Velocities. 423 
ge. 
This discovery is destined to produce a marked influence 
upon the production of metallic antimony and to greatly 
extend its uses. 
Professor S. P. Sharples, of Boston, after an examination of 
many specimens of the oxide of antimony, received from me, 
from almost white, a very dark brown. The specific 
gravity of one of the purest specimens, is 07, and it con- 
tained 5 per cent of water, an er cent of antimony. This 
* 
Star antimony. 
Art. XLVI.—Eaperiments made to determine the “ Drag” of 
Water upon Water at Low Velocities; by the Rev. SAMUEL 
AUGHTON and J. Emerson Reynoups, M.D.* 
A SPHERICAL ball of granite, unpolished, was suspended by 
a pianoforte wire, and allowed to hang freely; from the brass 
collar by which the ball was suspended an index projected on 
* From the Proceedings of the Royal Irish Academy, read Feb. 23, 1880. The 
term “Drag” is to be understood as signifying the combined effects of friction 
and viscosity 
