Specimen of steel produced by the Basic or Thomas Gilchrist process
Specimen of steel produced by the Basic or Thomas Gilchrist process, 1887, piece of 1/2" brass tubing 5 3/4" long, filled with metal
Specimen of steel produced by the Basic or Thomas Gilchrist process, 1887, piece of 1/2" brass tubing 5 3/4" long, filled with metal