alt Hacker NewsI was thinking about how they did the hollow part. The mold needs a carefully centered stopper where the shaft goes. Some sort of jig of wires to keep it in place.
I was thinking about how they did the hollow part. The mold needs a carefully centered stopper where the shaft goes. Some sort of jig of wires to keep it in place.
There's index hole on the bottom, you can see it running across. See more Stone Moulds from Terramare (Northern Italy): Analytical Approach and Experimental Reproduction Persistent Identifier https://exarc.net/ark:/88735/10145
Fig 11. Ophiolite multiple mould for razor and spear-head.