I

Platinum, 1 part; copper, 4 parts; or platinum, 1.5 parts; copper, 3.5 parts.

II

Platinum, 10 parts; tin, 90 parts; or platinum, 8 parts; tin, 92 parts.

III

Platinum, 7 parts; copper, 13 parts; tin, 80 parts.

IV

Platinum, 2 parts; steel, 98 parts.

V

Platinum, 2.5 parts; steel, 97.5 parts.

IV and V are for gun metal.

Miscellaneous White-Metal Alloys

I

For lining cross-head slides: Lead, 65 parts; antimony, 25 parts; copper, 10 parts. Some object to white metal containing lead or zinc. It has been found, however, that lead and zinc have properties of great use in these alloys.

II

Tin, 85 parts; antimony, 7.5 parts; copper, 7.5 parts.

III

Tin, 90 parts; copper, 3 parts; antimony, 7 parts.

ZINC ALLOYS: