PLATE 3. 
Figure. 
Atomic 
percentage 
of tin. 
Per cent, 
liy weight 
of tin. 
Magni¬ 
fication. 
Method of cooling 
the ingot. 
Method of 
etching. 
Description. 
24 
Sn 13-5 
22-5 
X 18 
C. 765“ 
HCl + FeCls 
Kesidue of a, white, in /3 
combs, darker. Liquid 
darkest. 
25 
22-5 
X 45 
C. 775“ 
Residue of a in darker 
striated /3. Dark chill 
primary of jS. Lic^uid 
light. 
26 
>> 
22-5 
X 18 
C. 740“ 
KII 3 (negative) 
Residual a, light, /i, dark. 
27 
22-5 
X 18 
C. 558“ 
HCl + FeCls 
New a, light. Uniform /j‘, 
dark. 
28 
Sn 14 
23-3 
X 18 
V.,s.c.c. 800“ 
55 
Primary a, light. Liquid 
and chill primary of /S, 
dark. 
29 
23-3 
• X 18 
V.s.c.c. 675° 
” 
Striated /3 only. 
30 
23-3 
X 18 
V.s.c.c. 600’ 
• 1 
New a, Avhite. Dark and 
striated /4. 
31 
» 
23-3 
X 18 
V.s.c.c. 530“ 
5 5 
New a, white. Uniform /i, 
dark. 
32 
23-3 
X 18 
V.s.c.c. 470“ 
¥ 
55 
a, dark. C' comjjlex (a + 8), 
light. j 
33 
Sn 15 
24-75 
X 18 
V.s.c.c. 600 
55 
Grains of uniform /?. 
34 
Sn 15-5 
25-5 
X 45 
C. 750° 
55 
Dark primary crystals of /i, 
chill primary of /?. Tin- , 
rich liquid, Avhite. 
35 
n 
25-5 
X 45 
C. 552“ 
55 
Uniform f3. Oblu^ue iUunii- j 
nalion. ; 
1 
1 
