press. drafts striking them. When cool the strips are soft ous shades, they are sent to the tempering room, and After marking, the pen is raised, that is, brought to and coated with a scale which is removed by a pickle the form that it is to have when finished. There are gradually reheated in a… … ground. straight ground. gives an in- lacquer, which THE MANUFACTURE 07 STEEL FENS.
Device · Apparatus · Steel · Pens · Scientific American · Cents · Wireless telegraph · Rapid transit · Magnetic north · Block weighing · American supplement · Air brake · American january · North Pole · Full particulars
Internet Archive · Public domain (published before 1931). Free to use for anything.
