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Ishi fishing spear head attachment.

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GlisGlis:
that's a nice item
When you watch cheap survival series you see the participants grab the first crooked limb they find and pretend to use it as spear or arpoon
Our ancestors clearly put alot of work and thinking and care to make their tools

DC:
I keep looking at the first picture. The forks that are attached to the shaft really don't look like they are that securely attached but I can't understand why. They are not tethered to anything so they would just head off downstream if they came loose. But they just don't look like they were meant to stay. They look like they are just poked into the binding.

PS After a second and third look maybe the're in there better than I thought but that area just looks fragile.

GlisGlis:
I see your point and here is my theory
the harpoon is real long
A well transfixed fish would probably be too heavy on the end of such shaft with the risk of breaking the forks or torn out of the fisherman hands the harpoon
maybe if the fish wont slid out of the forks the forks also is meant to detach from the main shaft
the bond between the two forks could be there to avoid divergence and to occasionally retain the other
sort of an extreme insurance

As all theories it's all BS until proven they're true   (lol)

wstanley:
I think the cordage has just come loose while in storage and therefore looks weak. There is another picture of Ishi actually attaching those forks with cordage. 

Here is my theory : ) :

As can be shown by the bottom shaft picture the business end has been tapered flat on each side to accommodate the forks, which themselves are tapered flat (assumed I cant actually see this). With proper tying and perhaps a litte pine pitch that would hold fairly strong. Add the small binding halfway between the forks, this helps to further squeeze the forks against the shaft and tighten the hold (this seems essential too keep those forks rigid). Those forks I think do very little other than to hold the tips which (I assume) are meant to come off immediately with the struggling of the fish. Like Glis said, I don't think you want a 5-8lb salmon wiggling at the end of a 10' pole. All a guess of course : )

wstanley:
Here are my thoughts for the detachable points:

-The piercing end of the detachable point appear to be metal. I will use the long bone of a deer instead.
-The wooden portion is likely drilled out on both ends to accommodate the piercing point, and the other is socketed out to fit on to the forks. Not sure what wood would be best, but I'm thinking perhaps mountain mahogany. This grows all around the Deer Creek area. This wood is tough and hard which is why I want to use it.
-I am assuming Ishi used sinew and pine pitch glue to attach the piercing end to the wooden portion (drilled out) as well as the cordage. The pine pitch glue serving to waterproof the sinew of course and add strength to the binding. In first photo it looks like sinew is unraveling (to me) on the point to the right.

Went out yesterday to look for a nice straight bull pine. Didn't have much time and although I saw quite a few decently straight ones, nothing that was good enough to match the straightness of Ishi's. I am being very picky and want one in which I have to take off as little material possible to reach the 1.5'' diameter shaft.

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