Watch Manufacturers' Alloys.

Some very tenacious and hard alloys, for making the parts of watches which are not sensitive to magnetism, are as follows:

 

I

II III IV

V VI VII

Platinum.

62.75 62.75 62.75 54.32

0.5 0.5 —

Copper.. .

18

16.20 16.20 16

18.5 18.5 25

Nickel... .

18

18 16.50 24.70

— 2 1

Cadmium.

1.25

1.25 1.25 1.25

— — —

Cobalt___

—

— 1.50 1.96

— — —

Tungsten.

—

1.80 1.80 1.77

— — —

Palladium

—

— — —

72 72 70

Silver. . , .

—

— — —

6.5 7 4

Rhodium.

    

1 — —

Gold.....

—

— — —

1.5— —

A non-magnetic alloy for watch-springs, wheels, etc.: Gold, 30 to 40 parts; palladium, 30 to 40 parts; copper, 10 to 20 parts; silver, 0.1 to 5 per cent; cobalt, 0.1 to 2.5 per cent; tungsten, 0.1 to 5 per cent; rhodium, 0.1 to 5 per cent; platinum, 0.1 to 5 per cent.

An Alloy for Watch Pinion Sockets

Gold, 31 parts; silver, 19 parts; copper, 39 parts; palladium, 1 part.