Re: Hold it a bit

Hi Arne,

Trepanning is a term used in medicine for boring a hole in someone's skull
but it is only used bacause of it's mechanical context. All it really means
is cutting a big hole with a small pointed tool. Usually this is
multipointed as in a holesaw and this is the form now used in medecine, but
it can also refer to cutting the hole by poughting a groove with a turning
tool in a lathe or using a 'tank cutter' in a drill (the kind of single
pointed tool on an arm mounted at right angles to a centre drill). The
earliest trepanning done medically ( to relieve pressure on the brain and
let out bad spirits ) was done with stone tools and involved slowly chipping
away a circular track in the skull until it broke through and the disk of
bone could be removed.

'Doctor' Ian
(Doctor of Insanity, Cairo [failed])

--
Ian W. Wright
Sheffield UK

----- Original Message -----
From: Arne Chr. Jorgensen <instel@...>
> ( a total side track: The word "trepan" ( I don't know :) but I
> think it is a medical term. They have found sculls 5000 years old,
> and they did some trepanning to fix each other brain after hitting
> each other with rocks. Hmm... maybe I need that kind of .... I
> would have to talk to my doctor - Ian - about it :)