Re: Crystal structure without diffraction?
From: Timo Nieminen (timo_at_physics.uq.edu.au)
Date: 10/04/04
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Date: Mon, 4 Oct 2004 11:20:08 +1000
On Fri, 1 Oct 2004, Gregory L. Hansen wrote:
> Andy Resnick <axr67@op.cwru.edu> wrote:
> >
> >I disagree with this assessment- discovering or synthesizing new
> >knowledge has never been trivial.
>
> There's no doubt about that. As Mati mentioned, they had to know that
> watching chandeliers swinging, or rolling balls down inclined planes were
> a good thing to study, and meaningfully interpret it. That's not so
> obvious if you hadn't already grown up with F=ma.
>
> >As for "inclined planes and swinging
> >chandeliers", the technical difficulties with making a perfectly flat,
> >straight and smooth channel of any reasonable length is considerable
> >without modern machinery- try it.
>
> It's still something that could be attempted by a craftsman in his
> workshop. Compare that with a modern craftsman testing the standard
> model in his garage.
We have (had?) a rolling balls down inclined planes to measure g 1st year
undergad experiment. Accuracy was woeful. (Not necessarily a bad thing for
a 1st year undergrad experiment - I also liked the one where I vs V was
measured for a couple of diodes and compared to (simplistic) theory. I had
little sympathy and few mark for the quartet who decided to trust the
theory and fabricate data to match.)
OTOH, one can home-build a Geiger counter. Is the theory sufficient to
predict decay rates with worthwhile precision? In any case, there is no
lack of worthwhile measurements that can be made with better accuracy and
precision.
-- Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/ Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
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