Archaeologists apparently think that ancient stone builders produced close fit in their building stones for aesthetic reasons, Actually the reasons were probably structural. Rough, irregular contact surfaces lead to high localized stresses, local crumbling failures, dust (lubricant), structural instability. Did they figure this out, a rather sophisticated technical notion? Maybe they were going on a theory of geometric stability –easier to stack bricks than boulders.
All the ancients did it, Mayans, Egyptians etc. almost certainly an engineering consideration. You can’t use the same set of tools for determining flatness or smoothness over thousands of years on different continents. You need concepts, and they can’t be operationally defined. Flatness and smoothness can be tactilely or visually determined, but you have to relate the knowledge of what is to be done, not just how to do it.
(( Write Transport Canada, mention Ca Zev experience -$400kk, new occ. kinematics, new performance criteria. Can they cooperate with other commonwealth members, Aussies, Anzies?. Determine total global market share we could influence, NA share?))
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