Legacy:Bar of Bronze
Two bars of copper and one bar of tin makes three bars of bronze. Bronze is a stronger metal than copper and tin, and can be used in the production of many types of tools. In addition, weapons and armor can be crafted from bronze that, while not always as strong as wrought iron or steel equipment, are generally much cheaper and less time-consuming to make. Bars of Bronze can be used to make repairs to plows made out of cast iron, and vice versa.
The main hurdle in acquiring bronze is the need for two types of metal, which cannot be procured from a single mine alone. Thus trade is often required in order to acquire sufficient stocks of both metals that may be used in producing bronze.
Quality
Quality of bronze bars seems to be determined by: (Qcopper+Qcopper+2*Qtin)/4, rounded down.
How to Acquire
You need an alloying crucible to make a bar of bronze. It must be fueled with charcoal and lit in order to produce bronze bars.
Craft > Metal Working > Bar of Bronze