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Forums10
Topics38,473
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Apr 27th, 2024
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Joined: Mar 2011
Posts: 4,081 Likes: 472
Sidelock
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Sidelock
Joined: Mar 2011
Posts: 4,081 Likes: 472 |
Obsidian is volcanic glass and needs no further heat treatment to be knapped. Beginners often practice on beer bottle bottoms or Thunder Chert aka Johnstone. TC and Johnstone aren't ideal but are easy to find. Gil
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Joined: Jan 2002
Posts: 7,703 Likes: 103
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 7,703 Likes: 103 |
Gil is messing with us. Thunder Chert aka American Johnstone is the porcelain water tank on your toilet. I always try to leave enough rind on the point to reflect whether it is Delta or some other make before I toss the points out into plowed fields for my grand kids to find...Geo
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Joined: Dec 2010
Posts: 1,224 Likes: 3
Sidelock
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Sidelock
Joined: Dec 2010
Posts: 1,224 Likes: 3 |
My mistake
Last edited by Mike A.; 08/01/17 10:53 AM.
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Joined: Dec 2010
Posts: 1,224 Likes: 3
Sidelock
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Sidelock
Joined: Dec 2010
Posts: 1,224 Likes: 3 |
Gil, thanks for the answer: wondered if I was doing something wrong....now I know I'm doing SOMETHING right!
Anybody know when safety glasses were invented? Were there lots of one-eyed aborigines? I wouldn't touch stone, especially obsidian, without glasses....
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Joined: Jan 2002
Posts: 7,703 Likes: 103
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 7,703 Likes: 103 |
Mike, I wear glasses, not safety though. Rarely something will get in my eye. Be very careful when that happens. When people watch my knapping, I try to shoo them off a good ten feet for safety...Geo
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Joined: Dec 2010
Posts: 1,224 Likes: 3
Sidelock
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Sidelock
Joined: Dec 2010
Posts: 1,224 Likes: 3 |
Thanks, George. Obsidian fragments are one of the sharpest natural objects. When I lived near RPI (engineering university in Troy,NY) the someone on the biomedical engineering staff there sold obsidian scalpel blades to cosmetic surgeons because they made the most delicate cuts then known. They use lasers for that now, I think.
I wear safety goggles when handloading, testing out a new gun, or knapping. Wonder if our ancestors used snow goggles or a mask or just left their vision up to the gods....
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