The original towers were fabricated in Italy. It would not be economical to go overseas to get a relatively small number of pieces. Would prefer sourcing from US.
I agree with responders that it's a nice looking detail and shaped to go with the flow of stress in the members, which are tension...
Here's part of a detail drawing showing some of the pieces. Hope that helps. http://files.engineering.com/getfile.aspx?folder=4135fe31-876b-4405-9e69-6c889ce325fc&file=angles_with_flatened_ends.pdf
We are in process of replacing some rusted members of lattice tower. The members are structural angle shapes with one of the legs at the ends bent out to create a wider, flat surface to accommodate bolting for the end connections. The bending process would seem to induce stresses in the angle...
