Some engineers and designers might think “cast iron” refers to early iron work, or that all early iron work was “wrought,” or that both may be true. They would be wrong.

It is disappointing that a Tribune editorial (“The sneaky scrap yard deal Emanuel dumped on Lightfoot” July 6) relied on cherry-picked and conflated information to criticize the operati… ...

Wrought iron may be welded in the same manner as mild steel, but the presence of oxides or inclusions will provide defective results. The following sections will discuss wrought iron in more detail.