Nevertheless, there is a mention (with picture) of "mine de plomb" (="lead
pencil") in the French version of Wikipedia:
http://fr.wikipedia.org/wiki/Mine_de_plomb
They were extensively used in Antiquity (Egyptians, Greeks and Roman).
But I don't think they have RoHS compliant problems ;-}
Jean-Louis Oneto
----- Original Message -----
From: "Alan Melia" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Tuesday, August 10, 2010 11:12 PM
Subject: Re: [time-nuts] Remove Pictic boards from envelopes
Hi Jim ...being "ironic"...see the "smiley"
Alan
----- Original Message -----
From: "jimlux" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Tuesday, August 10, 2010 11:55 PM
Subject: Re: [time-nuts] Remove Pictic boards from envelopes
Alan Melia wrote:
> Pencil?? only us oldies know what that is....... it is surprising the
"lead"
> pencil hasn't been banned under RoHS :-))
> Alan G3NYK
>
>
I don't know that "lead" (as in the element) has ever been used in
pencils.. I read a fascinating book on the history of the pencil a few
years back.. it described how graphite (the mines of Cumberland were
famous for graphite with good writing/drawing properties) was called
plumbago (lead ore) because chemical analysis didn't really exist and
the dense black substance seemed to resemble lead.
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