Maskinhallen. Torsten Althin bakom varmluftmotor tillverkad vid Åkers Styckebruk omkring 1879.
Svenskt styckebruk på 1640-talet. Kanontillverkning.Tavlan målad av Allard van Everdingen på 1640-talet och finns i Holländska Vetenskapsakedemiens hus Trippenhuis i Amsterdam.
Picryl description: Public domain image of an industrial building, factory, workshop, workers, 19th-20th century, free to use, no copyright restrictions.
Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description
Picryl description: Public domain photo of a factory, warehouse, commercial or industrial building, free to use, no copyright restrictions image.