COMPLETE EREEZINO-POINT CURVES OP BINARY ALLOTS, 
51 
Tlie freezing points on tlie rising branch of the curve up to lt)‘39 atoms, and to a 
lesser degree up to 30‘42 atoms, are very difficult to observe and are liable to a large 
experimental error. No solid matter can be detected for some time after the freezing- 
point. 
Table YIIc.—F reezing Points of Copper-Tin Alloys. 
Double Points. 
1 (1.) 
i 
Total weiglit of metals 
present. 
(2.) 
Percentage of 
tin. 
(3.) 
Atomic percentage 
of tin. 
(4.) 
Freezing point on 
the Centigrade 
scale. 
Cu 200, Sn 87-3 
30-39 
18-96 
757-00 A 
55 
746 5 B 
Cn 202-58, Sn 87-3 
30-12 
18-77 
746-05 B 
Cu 212-72, Sn 87-3 
•29-10 
18-04 
768-0 A 
745-8 B 
Cu 300-72, Sn 87-3 
22-,50 
13-47 
848-4 C 
J' 
5 1 
795-3 D 
At the points marked A there was much line sandy precipitate soon after reading, 
which rapidly increased until the mass was nearly solid, but not set, as the stirrer 
could still be moved a little. At the points marked B the stirrer set fast, before the 
reading the mass was really solid. The reading C was fugitive whilst the reading at 
D was very steady. 
In charting, these temperatures were all reduced by the subtraction of 1'5° to 
obtain agreement with Series 1. A comparison with Series 4 will show the justice 
of this correction. 
Series VIIc. was carried out six months after the others, and wdth a different 
pyrometer. 
