﻿486 
  Mr. 
  W. 
  C. 
  Roberts 
  on 
  

  

  Melting-points 
  of 
  Silver-Copper 
  Alloys. 
  

  

  No. 
  

  

  Parts 
  of 
  pure 
  

   silver 
  in 
  1000 
  

   parts 
  of 
  the 
  

   alloy. 
  

  

  Approximate 
  

   formula. 
  

  

  Melting-points, 
  

   in 
  degrees 
  Centigrade. 
  

  

  Observed. 
  

  

  Mean. 
  

  

  1. 
  

   2. 
  

  

  1000 
  

   (pure 
  silver). 
  

  

  ... 
  

  

  

  1040 
  

  

  925 
  

  

  Ag.Cu 
  

  

  919-9 
  

   9390 
  

   934-5 
  

  

  931-1 
  

  

  3. 
  

  

  820-7 
  

  

  Asr 
  Q 
  Cu 
  

  

  53 
  

  

  874-6 
  

   891-8 
  

   9005 
  

   877-8 
  

  

  886-2 
  

  

  4.* 
  

  

  798 
  

  

  Ag 
  5 
  Cu 
  2 
  

  

  882-4 
  

   885-4 
  

  

  889- 
  5 
  

  

  890- 
  9 
  

  

  887-0 
  

  

  5* 
  

  

  773-6 
  

  

  Ag 
  2 
  Cu 
  

  

  854-9 
  - 
  

  

  857-9 
  

  

  862-3 
  

  

  858-3 
  

  

  6* 
  

  

  750-3 
  

  

  Ag 
  7 
  Cu 
  4 
  

  

  852-3 
  

   848-5 
  

  

  850-4 
  

  

  7. 
  

  

  718-93 
  

  

  Ag 
  3 
  Cu 
  2 
  

  

  868-4 
  

   863-5 
  

   879-5 
  

  

  870-5 
  

  

  8. 
  

  

  630-29 
  

  

  Ag 
  Cu 
  

  

  851- 
  9 
  

   844-9 
  

   837-6 
  

  

  852- 
  7 
  

  

  846-8 
  

  

  9. 
  

  

  600 
  

  

  

  854-9 
  

   849-8 
  

   858-6 
  

   864-6 
  

  

  857-0 
  

  

  10* 
  

  

  569-6 
  

  

  Ag 
  7 
  Cu 
  9 
  

  

  897-6 
  

   902-2 
  

  

  899-9 
  

  

  11.* 
  

  

  561-1 
  

  

  Ag 
  3 
  Cu 
  4 
  

  

  910-8 
  

   914-8 
  

   927-2 
  

  

  91/-o 
  

  

  12.* 
  

  

  540-8 
  

  

  A 
  g 
  20 
  Cu 
  29 
  

  

  914-1 
  

   9160 
  

   921-5 
  

   927-6 
  

  

  919-8 
  

  

  13* 
  

  

  500 
  

  

  Ag 
  3 
  Cu 
  5 
  

  

  931-9 
  

  

  944- 
  1 
  

  

  945- 
  6 
  

  

  940-8 
  

  

  