Henley's Twentieth Century Formulas, Recipes and Processes. Various

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СКАЧАТЬ yet become an article of general commerce. It will be sufficient to note these materials briefly, giving the composition of the most important.

      Nickel Bronze.

      —This is prepared by fusing together very highly purified nickel (99.5 per cent) with copper, tin, and zinc. A bronze is produced containing 20 per cent of nickel, light-colored and very hard.

      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.

      XIII.—Platinum, 62; iron, 28; gold, 10.

      XIV.—Gold, 48; zinc, 52.

      XV.—Steel, 50; rhodium, 50.

      XVI.—Platinum, 12; iridium, 88.

      XVII.—Copper, 89.5; tin, 8.5; zinc, 2.

      Lead Alloys.

      The following alloys, principally lead, are used for various purposes:

      Bibra Alloy.

      —This contains 8 parts of bismuth, 9 of tin, and 38 to 40 of lead.

      Metallic Coffins.

      —Tin, 40 parts; lead, 45 parts; copper, 15 parts.

      Plates For Engraving.

      —I.—Lead, 84 parts; antimony, 16 parts.

      II.—Lead, 86 parts; antimony, 14 parts.

      III.—Lead, 87 parts; antimony, 12 parts; copper, 1 part.

      IV.—Lead, 81 parts; antimony, 14 parts; tin, 5 parts.

      V.—Lead, 73 parts; antimony, 17 parts; zinc, 10 parts.

      VI.—Tin, 53 parts; lead, 43 parts; antimony, 4 parts.

      Hard lead is made of lead, 84 parts; antimony, 16 parts.

      Sheet Metal Alloy.—

Tin	35 parts
Lead	250 parts
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