34 
MESSRS. C. T. HEYCOCK AND F. H. NEVILLE ON 
These experiments, when plotted, show that there is no inflexion in the cuiwe on 
the silver side. 
The ingot of alloy weighed 220‘5 grains, while the metals used weighed 
222’2 grams. 
At the first three readino-s of this series snrfusion was noticed. 
o 
Table Ib.— Freezing Points of Alloys made by adding Silver to Copper, 
Series 1.—200 grams Copper. 
(1.) 
Total weight of 
.silver present. 
(2.) 
Percentage of 
silver. 
(3.) 
Atomic 
percentage of 
silver-. 
(-t-) 
Freezing point 
on the Centigi-ade 
scale. 
(5.) 
Atomic fall. 
0 
0 
0 
1081-5 
1023 
-51 
-30 
1079-1 
8-b* 
4'374 
2-14 
1-27 
1071-1 
S-2 
9-.532 
4-55 
2-72 
1059-1 
8-24 
14-84 
691 
4-17 
1048-1 
8-01 
29-85 
1-2-99 
8-05 
1019-6 
7-69 
1020-8 
7-544 
45-OG 
18-39 
11 67 
996-5 
7-28 
60-07 
23-10 
1498 
976-0 
7-04 
80-3 i 
28-66 
19-07 
953-5 
6-71 
100-54 
33-45 
22-77 
934-4 
6-46 
120-68 
37-64 
26-15 
917 4 
6-28: 
* \Yheu the silver was dropped into the molten copper it appeared to boil. 
t Up to tliis point coal-gas had been used to protect the surface of the copper from o.'cidation, but so 
much finely divided gas carbon had formed in the crucible that pure dry hydrogen was henceforward 
used. The gas carbon does not form over molten silver at its melting point. This reading was taken 
two days after the preceding. 
+ The weight of the metals used was 320’7 grams, but the ingot, after dipping while hot in dilute 
sulphuric acid, weighed 310'4 grams. The surface of the ingot was mottled with white spots on a ground 
of copj^er colour. 
