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

Автор: Various

Издательство: Bookwire

Жанр: Языкознание

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isbn: 4057664126917

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СКАЧАТЬ Quality I. 8 3.5 4 Finest quality. II. 8 3.5 6 Beautiful, but refractory. III. 8 6.5 3 Ordinary, readily fusible. IV. 52 26.0 22 First quality. V. 59 30.0 11 Second quality. VI. 63 31.0 6 Third quality.

      The following analyses give further particulars in regard to different kinds of German silver:

For sheet Copper Zinc Nickel Lead Iron
(French) 50.0 31.3 18.7
(French) 50.0 30.0 20.0
(French) 58.3 25.0 16.7
Vienna 50.0 25.0 25.0
Vienna 55.6 22.0 22.0
Vienna 60.0 20.0 20.0
Berlin 54.0 28.0 18.0
Berlin 55.5 29.1 17.5
English 63.34 17.01 19.13
English 62.40 22.15 15.05
English 62.63 26.05 10.85
English 57.40 25. 13.0 3.0
Chinese 26.3 36.8 36.8
Chinese 43.8 40.6 15.6
Chinese 45.7 36.9 17.9
Chinese 40.4 25.4 31.6 2.6
Castings 48.5 24.3 24.3 2.9
Castings 54.5 21.8 21.8 1.9
Castings 58.3 19.4 19.4 2.9
Castings 57.8 27.1 14.3 0.8
Castings 57. 20.0 20.0 3.0

      In some kinds of German silver are found varying quantities of iron, manganese, tin, and very frequently lead, added for the purpose of changing the properties of the alloy or cheapening the cost of production. But all these metals have a detrimental rather than a beneficial effect upon the general character of the alloy, and especially lessen its power of resistance to the action of dilute acids, one of its most valuable properties. Lead makes it more fusible; tin acts somewhat as in bronze, making it denser and more resonant, and enabling it to take a higher polish. With iron or manganese the alloy is whiter, but it becomes at the same time more refractory and its tendency toward brittleness is increased.

      Substitutes For German Silver.

      There are many formulas СКАЧАТЬ