SOLDERLESS WRAPPED CONNECTIONS 



PART III 



605 



connections originally met the initial test requirements outlined above 

 for resistance variation. They were then subjected to the indicated ex- 

 posures including being kept in the Humidity Room at 85°F and 95 per 

 cent relative humidity for periods up to two and one-half years, fol- 

 lo\ving which they were remeasured. In no case was any barrier film 

 found which did not break down at 25 microvolts nor was any resistance 

 variation in excess of 0.002 ohms observed. Some of these terminals are 

 sho^vn in the photographs of Figs. 10 and 11. Upon unwrapping some 

 of these connections there were still considerable areas which were 

 bright (See Fig. 12), indicating that they were still gas-tight. This would 

 seem to indicate a life expectancy of many years. Since connections 



2 300 



i:?375 



0C225 

 (/) 



IL 



O200 



H 

 Z 

 111 

 O 175 



cc 



UJ 



a. 



z 



150 



^ 100 



75 



50 



25 



10 



20 



80 



90 



30 40 50 60 70 



PER CENT OF MAXIMUM RADIUS 



Fig. 9 — Stripping force as a function of radius of wrapping tool. 



100 



