388 



BELL SYSTEM TECHNICAL JOURNAL 



Fig. 6 — Step sector disk used for plate calibration. 





Sn2363 Sn2840 



Pb2657 



%Sn 

 0.001 

 0.003 

 O.OI 

 0.02 

 0.03 

 0.10 



lA 

 2A 



f2B 

 |2C 



0.003 

 0.02 

 0.03 

 0.10 



CALIBRATION 



Fig. 7 — Analysis of lead-antimony cable sheath for tin. An application of the 

 internal standard method with plate calibration by the step sector. 



