On Mar 14, 12:03*pm, Reentrant > wrote:
> On 14/03/2011 11:09, Bernard Peek wrote:
>
>
>
> > ... The type of glass pan that can be put on direct heat
> > is a comparatively new invention.
>
> Maybe, but glass test-tubes and conical flasks have been used over
> Bunsen burners for a very long time.

Your point being....?