Delta Metal
an alloy consisting of copper and zinc-in other words, brass-to which some manganese has DEMAGOGUE been added in the form of ferro-manganese, or spiegeleisen, which contains but enough of this is usually present in manganese. A little silicon is also used, also used, ferromanganese. Delta metal has similar properties to phosphor-bronze, if, indeed, some of it is not simply man- It is used for parts of machinery and for ornamental work. water, or inundation; specifically, the