50 Scientific Proceedings, Royal Dublin Society. 



Table 3. 



Single emanation tube in long serum needle, partially withdrawn at intervals so as 

 to distribute the activity as uniformly as possible along a line 100 mm. long. 



a = distance in millimetres from axis of tube. 



i = „ „ „ „ " equatorial plane " (perpendicular to axis at 



centre point of this line). 



