Author Topic: "no bulp of percussion" thinning  (Read 11303 times)

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Offline JackCrafty

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Re: "no bulp of percussion" thinning
« Reply #15 on: December 29, 2015, 10:20:25 am »
A perverse fracture will snap a point in half but it will not look like a perfect "snap" break, if you know what I mean.  On a small scale, a perverse fracture is the thing that takes off a barb when you're trying to notch a point.  Especially with deep notches.  The "wave" of the fracture doesn't run parallel to the face to create a shell-like scar.  It turns almost perpendicular and "slices" through the workpiece.  There are pictures out there of artifacts with this type of fracture but it may take a while to find a good one...
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline JackCrafty

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Re: "no bulp of percussion" thinning
« Reply #16 on: December 29, 2015, 12:38:47 pm »
Oh yeah, you can also look up "Perverse Fracture" and "Bending Initiation" in my glossary of terms.  I updated a few terms like "Transverse Fracture" and related stuff but the first two terms have not been modified.   ;D
Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

Offline iowabow

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Re: "no bulp of percussion" thinning
« Reply #17 on: December 29, 2015, 02:25:39 pm »
Caneman, now that I know the trem yes I am on the edge of a perverse facture. Thank you Patrick. I never knew the name of that before thank you guys.
(:::.) The ABO path is a new frontier to the past!