This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Stetefeldt roasting furnace. fr Four griller les minerais d'argent ou d'or de Carl August Stetefeldt ou Charles Stetefeldt fr Roasting kiln by Carl August Stetefeldt also Charles Stetefeldt design to roast gold and silver ores Text Appearing Before Image Stetefeldt's Roasting Furnace This furnace now being built at Austin Nevada