Smithsonian Report, 1924.— Whitney 



Plate I 



m 



\ 



. A Demonstration of the Straight-Line 

 Distillation Which Takes Place in Good 

 Vacua. In the Right-Hand Bulb, Which 

 Has I NSiDE Elements Duplicating Those in 



THE LEFT-HAND BULB. THE SHADOW PATTERN 

 OF THE I NTERPOSING STAR SHOWS CLEARLY IN 



THE Film of Metal Distilled onto the 

 Interior Wall 



2. HiTTORF Experiment in Which an Elec- 

 tric Current Passed from One Bulb to the 

 Other at Low Gas Pressure Prefers the 

 Longer of the Two Tube Paths 



