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From: Jasen Betts on 11 May 2010 04:29
On 2010-05-10, john <vegan16(a)accesscomm.ca> wrote:
> On May 9, 8:54 pm, Bret Cahill <BretCah...(a)peoplepc.com> wrote:
>> http://en.wikipedia.org/wiki/Earthquake_engineering#Friction_pendulum...
>>
>> "People of Inca civilization were masters of the polished dry-stone
>> walls, called ashlar, where blocks of stone were cut to fit together
>> tightly without any mortar.
>>
>> . . .
>>
>> "Peru is a highly seismic land, and for centuries the mortar-free
>> construction proved to be apparently more earthquake-resistant than
>> using mortar. The stones of the dry-stone walls built by the Incas
>> could move slightly and resettle without the walls collapsing which
>> should be recognized as an ingenious passive structural control
>> technique "
>
> But were they cut?
> I've heard that story before.

Yeah, ball and socket not unlike giant Lego.



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