Although the quantitative interpretation of three-dimensional structures from two-dimensional sections is recent, the use of such sections in understanding matter and in enjoying it is old. The first action of a curious person in studying a stone or a stick or a piece of metal is to break it in two. Yet fracture is not a section, and the structural science of materials did not begin until the artisan’s fracture test was replaced by Sorby’s careful polished sections which presented the structure without distortion, though accepting the differences between a plane section and three-dimensional reality.
KeywordsClay Century Nickel Carbide Welding Agate
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