"Steve Firth" wrote in message
.. .
derek wrote:

Professor Unwin, I assure you that around here I can show you stone
(most likely millstone grit) walls that have deflected (The stones
have bent it's not that the all the motor joints have broken and the
wall is just a collection of stones in formation) by about an inch in
a 5 foot run under their own weight and the weight of the stones above
them.

I'm wondering what sort of engineer he is (service 'engineer'?) Any
engineer worth his salt knows that rock and glass both flow. On one
degree course that I know of engineering students were monitoring the
changes in the glass of the building that they worked in. Knowing that
glass and rock will deform and flow under pressure is essential for
civils. If they can't design around the known characteristics of the
material then they are **** all use to anyone.

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I keep asking myself what use you are Steve but as yet you havent been any