The next time you find yourself in need of some large-ish plastic springs, maybe consider [PattysLab]’s method for making plastic springs out of spare filament. The basic process is simple: tightly ...

A PAPER by F. W. Harbord at the autumn meeting of the Iron and Steel Institute gives an account of the history of the Thomas-Gilchrist basic process from 1879 to the present date, from the preliminary ...