Aluminium Zinc
Alloys of aluminium and zinc are very hard and take a beautiful polish. An alloy of 97 parts of aluminium and 3 of zinc gives a result that is as white as the pure metal, harder than aluminium and very ductile.
How to true a balance, repair a chipped dial, temper a spring or test a stone — the working bench-book of the American watch trade, arranged A to Z.
Alloys of aluminium and zinc are very hard and take a beautiful polish. An alloy of 97 parts of aluminium and 3 of zinc gives a result that is as white as the pure metal, harder than aluminium and very ductile.