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§ 4. Silver. This was also supplied by Dr. C. Hoitsema and drawn 

 to a wire of 0.1 m.m. by Heraeus, during which operation it was 

 treated in exactly the same way as the gold and the platinum. 

 After the resistance had been determined, the composition was con- 

 trolled ; the silver contained then 0.18% impurity. The zero point 



