Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!olivea!uunet!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!isgate!krafla!thsa
From: thsa@rhi.hi.is (Thorvaldur S Arnarson)
Newsgroups: comp.sys.acorn
Subject: Re: Archimedes keyboard
Keywords: Keyboard, defunct
Message-ID: <2837@krafla.rhi.hi.is>
Date: 26 Feb 91 17:17:27 GMT
References: <1991Feb19.160812.20483@cns.umist.ac.uk> <2313@cybaswan.UUCP> <1991Feb21.143445.22959@fwi.uva.nl> <2835@krafla.rhi.hi.is>
Reply-To: thsa@rhi.hi.is (Thorvaldur S Arnarson)
Organization: University of Iceland (RHI)
Lines: 30

In article <2835@krafla.rhi.hi.is> kvj@rhi.hi.is (Kristjan Valur Jonsson) writes:
[stuff deleted]
|Firstly, the mouse isn't Acorns, but a ready built design from elsewhere.

True, but it was presumably not forced upon them!  They bear full 
responsibillity for any flaws the final product may have.

|If you look at a state of the art mouse these days, they all seem to
|have these new light types of balls.  I suspect that the reason is that
|lighter balls have less inertia (can't remember the correct term for this
|"axial inertia") and therefore better response.  You must be thinking about
|an old Macintosh mouse.

Utter nonsense!!!!!  How about the new Logitec mouse, thats fairly state
of the art.  If the coupling between the ball and the direction sensing
mechanism is frictionless the weight of the ball does not matter.  If there
is friction (yes this is not a textbook on elementary physics!) the weight
matters as increased weight decreases the 'sensing friction' vs 'friction 
between ball and surface' ratio.
Inertia???!  How fast does your hand/mouse change directions?

|
|Kristjan
|

Best regards,
  Thorvaldur S. Arnarson.
-- 
  Regards,
  Thorvaldur S. Arnarson