Jon Ellison wrote:

> Just tried the straight edge on a chromium mirror vs. an
>opaque surface, the back of the same mirror.
>Anyone doubting this can do it themselves, pocket mirror and
>steel ruler.

>The reflective surface gives an indication that the gap is
>slightly greater. NOT less.

Wow... really! Now the "mirror-like" part is kind of remembered but the "transparent to translucent" part missed again........... anyway you might combine those 2 notions together and try it again?

So for some reason they are not getting any internal reflection of the light within the granodiorite's mirror-like polished surfaces of transparent to translucent minerals or are they just ignoring it so that the claim of no light coming through can be made more easily.... you know because they are experienced?

>Engineers have to deal with surfaces of varying reflectance.
>Dunn is amply experienced enough to take this into account.

Ya he's experienced enough to know the validity of the claimed experimental result that granite can barely be scratched with diamond, and that the rate for the carving of hieroglyphic is the best for calculating the rate the ancient Egyptians quarried granite........ you're right about that one he's experienced enough to know what's valid and what's not.

>Fortunately Dunn used other methods to corroborate.
>Therefore unless he is lying. At present we have to accept his
>measurements.

We should really wait until someone actually confirms his claims and as well tests the polished bumpy ones and the ones that are not polished just to see what they produce in terms of measured advanciness.

Archae Solenhofen (solenhofen@hotmail.com)