File:History of Inventions USNM 33 Metallurgical Process.png
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English: No. 1. Nuggets of iron ore, slightly modified, from the mounds of Kentucky.
No. 2. Pieces of iron ore modified by flaking and rubbing to form the blades of common tools. Mounds of the Mississippi Valley, 90,733, 19,601. 62,024 No. 3. Pieces of iron ore polished. Mounds of the Mississippi Valley, 34,652, 34,521 No. 4. Pieces of crude copper ore cold hammered into shape. Lake Superior re^on 1,136, 31,937 No. 5. Ck)pp€r cold hammered into sheet and arrowhead. Mounds of Ohio and Michigan 10,213, 113,738 No. 6. Sheets of copper cold hammered into shape and perforated. Embossed by punching. Mounds of Wisconsin 88,387, 90,737 No. 7. Sheet of copper crimped and corrugated by hammering. Mounds and Northwest coast 61,174, 67,947 No. 8. Copper cast into form of ancient half-socketed ax or adz. Wisconsin. No. 9. Bronze hatcliet blades from Europe. Casts showing the steps in the art of socketing 140,721, 101,109. 10,116 No. 10. Cast-iron fish, showing the latest results of fine casting 95,021 No. 11. Example of rude forging. Angola, Africa 131,311 No. 12. Example of anvil work and swaging of a rude kind. Angola, Africa, 153,176 No. 13. Example of common welding or uniting two pieces of the same metal by heating in open fire with a flux and hammering them together. No. 14. Example of riveting two pieces of iron together with pegs of the same metal. No. 15. Example of uniting two edges of metal by soldering or brazing__ 167,854 |
| Date | |
| Source | Walter Hough (1922). Synoptic series of objects in the United States National Museum illustrating the history of inventions. Proceedings of the United States National Museum 60 (2404). 1-47, 56 pl. |
| Author | United States National Museum (Smithsonian Institution), Washington D.C. |
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