58 Mr. W. 0. Huberts on the Examination of certain 



meter. The results are given in the Table and in curve 

 No. II. 



The alloys of Tin and Copper , taken as representative of 

 the third group, are peculiar. Their tints and fractures are 

 widely different; and the series is interesting as having various 

 industrial .applications. As many of them are too brittle to roll, 

 a block of each alloy 18 millims. square by 7 millims. thick 

 was formed with the file. The results are given in the Table 

 and on the curve No. III. 



No. 



Percentage 

 composition. 



Approximate 

 formula. 



Readings on 

 Induction- 

 balance. 





i !• 



100 (pure tin). 





67-5 





2. 



77-37 



Sn 6 Pb 



62 



p 



3. 



69-60 



Sn t Pb 



59-0 



■< 



4. 



53-20 



Sn., Pb 



525 



3 - 



5. 



3630 



Sn"Pb 



510 



i, 



6. 



22-30 



Sn Pb 2 



47-0 



H 



7. 



12-50 



Sn Pb, 



45-0 





8. 



8-60 



Sn Pb 6 



460 





1 9. 



(pure lead). 





43-0 



( : 



100 ( pure silver). 





225 





2. 



9997 





209 





3. 



99-90 





205 





4. 



9950 





192 





5. 



9910 





170 





6. 



9802 





148 



o 



j 



7. 



94-93 





115 



o 



8. 



90-00 





84 



9. 



81-40 



Ag 8 Au 



60 



H 



10. 



68-70 



Ag 4 Au 



48 



£ 



11. 



52-30 



Ag 2 Au 



44-5 



o3 



12. 



35-50 



Ag Au 



42-8 





13. 



21-50 



Ag 'Au 2 



44 





14. 



1200 



Ag Au 4 



49 





15. 



8-30 



Ag Au 6 



60 





16. 



41 





90 





U7. 



(pure gold). 





150 





f 1. 



100 (pure copper). 





167 





2. 



8900 



Sn Cu 15 



65 





3. 



84-33 



Sn Cu 10 



51 





4. 



7902 



Sn Cu 7 



45 



>5 



5. 



72-91 



Sn Cu. 



40 



6. 



68-28 



Sn Cu 4 



37 





7. 



6500 





49 



o 



8. 



61-79 



Sn Cu 3 



83 



o 



9. 



51 84 



Sn Cu. 



73 





10. 



34 99 



Sn Cu" 



73 





11. 



973 



Sn 5 Cu 



82 



1 



12. 



(pure tin). 





85 



Xote. — The Alloys were not annealed ; and the temperature was about 

 15° C. 



