Jan. 18, 1918] 



Studies on Liquid Films 



378 



in diameter, with a constriction of 1 mm. bore, and a 25 mgm. drop. 

 Four of these Hnked together and forming a chain inclined at about 

 45' to the vertical were photographed on a Lumiere autochrome 

 plate, which, in addition to the colom-ed contours, showed clearly the 



Fig. 9. 



Fig. 10. 



brilliant bands on the plane films between the equal segments. To 

 obtain these photographs the cubical glass vessel was placed in full 

 sunlight. The top and two opposite sides were covered with thin 

 tissue paper to give uniform dijffuse illumination. Black paper 

 formed the background, while the front was left clear for exposure 



