PLATE 7. 
Fis;ure. 
O 
Atomic 
percentage 
of tin. 
Per cent. 
Iry weight 
of tin. 
Magni¬ 
fication. 
Method of cooling 
the ingot. 
Method of 
etching. 
Description. 
72 
Sn 27 
40-8 
X iS 
C. 565“ 
nCl f FeCls 
Plates of 7 / with inclusions 
of liquid (due to G trans¬ 
formation). 
73 
Sn 28 
42 • 05 
X 45 
S.c.c. 650° 
Uniform lobes of y. Chill 
primary of y. Dark tin- 
rich liquid. 
74 
42 ■ 05 
X 45 
S.c.c. 625° 
yy 
Same as preceding, except 
that the G reaction has 
occurred. 
75 
Sn 33 
47-9 
X 45 
C. 676° 
j? 
Primarj" y. y chill primary. 
76 
47-9 
X 18 
C. 644° 
Primary of y. Chill 
primary of t]. 
l-r 
i t 
>> 
47-9 
X 45 
C. 644° 
? 5 
Piimary of y. Chill 
jjrimary of 
78 
47-9 
X 45 
C. 628° 
n 
Same, after the G trans¬ 
formation. 
79 
Sn 38 
53-35 
X 45 
C. 644° 
Primary y. Chill primary 
of 
80 
} 5 
53 • 35 
X 45 
C. 628° 
3 3 
The incomplete G trans¬ 
formation. 
81 
n 
53-35 
X 45 
C. 606° 
33 
The complete G transforma¬ 
tion. 
82 
Sn 42 
57-5 
X 18 
C. 600° 
33 
Primary and chill primary 
of 7 ;. 
S3 
Sn 38 
53-35 
X 45 
S.c.c. 445° 
33 
Primary 7 / after 70 hours 
in boiling sulphur. 
