[Foundation-l] Long-term archiving of Wikimedia content

[Jussi-Ville Heiskanen]

David Goodman wrote:
> additionally, a simple lens can be ground  with hand tools and no
> preexisting technology except glassmaking to produce several hundred
> power magnification
>
>   

Not that I want to denigrate glass makers, but what is
wrong with naturally occurring clear material such as
rock crystal and the like?


Yours,

Jussi-Ville Heiskanen