﻿a Problem in Viscosity. 



1007 



liquid must fill the entire cross-section of the tube, and will 

 not begin to fall out of the tube till the column becomes so 

 high that the gravitational forces become appreciable and 

 the conditions supposed tire violated. 



II. Apparatus. 



In order to test these theoretical considerations arrange- 

 ments were made to draw metal strips or wires at known 

 speeds out of a stable liquid, the viscosity of which could be 



Fier. 2. 



y/>/s/»;» >//k 



rzirziz 



varied by change of temperature and which would solidify 

 at ordinary temperatures, so that the thickness of the layer 

 could be measured. 



The apparatus was designed so that the viscosity of liquid 

 and the surface tension could be measured under the condi- 

 tions prevailing when the wire or plate was drawn from it. 



