12 



t two G Is into the Alloy when casting 



the /inc-antimony into tin- riiu;s. At 550 K. it shows 

 15 galvr., and at 400 F., 25 galvr. Again with similar 



cast two German silver leads into the alloy: at 350 I it 

 shows i galvr. ; and at 410 F., i galvr. the same. But if one 

 German silver lead and one Copper lead is used, at 4 1 

 it shows 42 galvr. Construct three of these rings, I 

 their leads firmly together, German silver to Copper : at 

 330 F. we get 50 galvr., and at 410 F., 60 galvr. 



Again, let us take a piece of 20 gauge sheet Iron, like 





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