| Humans have been toolmakers for at least 2.5 million years. The earliest technology was a practically oriented tool kit of haphazardly shaped chopping, cutting, and scraping implements fashioned from pebbles. From the later stone ages, archaeologists have identified some 60 or 70 standard kinds of intricate tools with very specific purposes; some had ceremonial uses. While the ax-head, arrowhead, scrapers, borers, and flakes in this picture were all made of stone, materials such as bone and ivory were also used. Tools like these can be made by direct percussion (using a hammerstone or other implement to knock flakes from the raw material) or indirect percussion (using the hammerstone to strike a chisel-like tool that is precisely positioned on the raw material). |
Hotmail
Messenger
My MSN
MSN Directory
