The TRIRADIUS in a fingerprint: how it develops, it's characteristics + a definition!

Martijn (admin) wrote:

Patti wrote:

Where you placed the yellow dot is where I also see a potential triradius, actually the fbi type lines, but if you move inward as instructed to the almost Y shape below the solid triangular shape, one side has an ending ridge, which is the same as you traced lower down. So if the lower one counts as parallel diverging ridges (and I think it would) the higher up/closer to the pattern should as well.

So I would place the triradial point on the triangular ridge. The whole thing would be the triradial point. The type lines form a sort of Y shape immediately below.

Yes Patti, I can understand why you see it that way.

But we have to be aware of Galton's rule - so you can not describe both points (my golden dot + the solid ridge triangle as a triradius) as a triradial point.


PS. Sorry, now I no longer understand your ealier words:

"I would, however, place the triradial point at the place where the ridge to the right of this triangular plot, abuts a ridge at the lower left."

(Sounds like you were talking about a point on the ridge-side of the triangle, but now you're only talking about a point on the left-side of the trirangle.... )