A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...

150 THE METALLURGY OF ANTIMONY.
crucible, and, after its fusion, add 1 kilo, of copper, in shreds of plate,
5 kilos, of lead, and finally, after strong heating, 2 kilos, of antimony.
Add to this mixture 1 kilo, of common type-metal (made from 25
kilos, of lead and 5 kilos, of antimony).
The following is a list of the common type-metals :—
Type-metal
Stereotype plate
Linotype metal
Type-metal . . . .
Lead.
55
60
70
82
55
61*3
69*2
80
50
65*1
8571
70
84*5
72
Antimony.
30
25
18
14*8
227
18*8
19*5
20
2777
5-82
33 34
14-29
15
13*5
18
Tin.
15'
15
10 3-2
22-1
20-2
9-1
...
2
25
Copper.
2*
17
bismuth
22-23
bis. 29*58
•• •
...
bismuth 15
(d) Hard Lead.—It is a particularly useful alloy, suitable for many
technical purposes in which the lead, when used alone, possesses too
low a melting-point; and further, it is used to make cocks and valves
that come into contact with acids in chemical works. It is obtained
from antimony ore containing much lead, and also as a by-product
from smelting works. Its usual composition is 22 per cent. Sb and
78 per cent. Pb.
Antimony-lead alloys, according to Matthiessen :—
Antimony.
100
54-1
37-1
227
16-4
10-5
5-5
2*3
...
Composition.
i
Tjftarf i Atomic
Leadc • Formula.
I
... | Sb
45-9 i SboPb
62-9 i SbPb
77*3 ! SbPbo
83-6 SbPb3
8S-5 SbPb5
94-5 SbPb,0
97-7 SbPba,
00 . Pb
Found.
6713
8-201
8-989
9*811
10-144
10-586
10-930
11-194
11-37(5
Calculated.
8*268
9*045
9-822
10-211
10*599
10-952
11-196
...
Specific Gravity.
Difference.
...
Exp. j Cont.
0-067
0-056
0-011
0*067
0*013
0'022
0-002 ;