Magnitogorsk Iron and Steel Works blast furnace, c. 1931.
https://s3-us-west-1.amazonaws.com/h...e_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...260#post161425
https://www.homemadetools.net/forum/...931#post148785
https://www.homemadetools.net/forum/...890#post148654
https://www.homemadetools.net/forum/...977#post140783
https://www.homemadetools.net/forum/...347#post146386
