Part 40

«Bismuth Bronze.»—

I II III IV Copper 25.0 45.0 69.0 47.0 Nickel 24.0 32.5 10.0 30.9 Antimony 50.0 — — — Bismuth 1.0 1.0 1.0 0.1 Tin — 16.0 15.0 1.0 Zinc — 21.5 20.0 21.0 Aluminum — — 1.0 —

I is hard and very lustrous, suitable for lamp reflectors and axle bearings; II is hard, resonant, and not affected by sea water, for parts of ships, pipes, telegraph wires, and piano strings; III and IV are for cups, spoons, etc.

«Manganese Argentan.»—

Copper 52 to 50 parts Nickel 17 to 15 parts Zinc 5 to 10 parts Manganese 1 to 5 parts Copper, with 15 per cent phosphorus. 3 to 5 parts

Readily cast for objects of art.

«Aphtite.»—

Iron 66 parts Nickel 23 parts Tungsten 4 parts Copper 5 parts

«Arguzoid.»—

Copper 55.78 parts Zinc 23.198 parts Nickel 13.406 parts Tin 4.035 parts Lead 3.544 parts

Silver white, almost ductile, suited for artistic purposes. {71}

«Ferro-Argentan.»—

Copper 70.0 parts Nickel 20.0 parts Zinc 5.5 parts Cadmium 4.5 parts

Resembles silver; worked like German silver.

«Silver Bronze.»—Manganese, 18 per cent; aluminum, 1.2 per cent; silicium, 5 per cent; zinc, 13 per cent; copper, 67.5 per cent. The electric resistance of silver bronze is greater than that of German silver, hence it ought to be highly suitable for rheostats.

«Instrument Alloys.»—The following are suitable for physical and optical instruments, metallic mirrors, telescopes, etc.:

I.—Copper, 62 parts; tin, 33 parts; lead, 5 parts.

II.—Copper, 80; antimony, 11; lead, 9.

III.—Copper, 10; tin, 10; antimony, 10; lead, 40.

IV.—Copper, 30; tin, 50; silver, 2; arsenic, 1.

V.—Copper, 66; tin, 33.

VI.—Copper, 64; tin, 26.

VII.—Steel, 90; nickel, 10.

VIII.—Platinum, 60; copper, 40.

IX.—Platinum, 45; steel, 55.

X.—Platinum, 55; iron, 45.

XI.—Platinum, 15; steel, 85.

XII.—Platinum, 20; copper, 79; arsenic, 1.