The main stages of the development can be defined in the following order: simple tools, accumulation of tools, sophisticated tools; the actuation of the complex tools by single engine - human hands, bringing these tools into action by the forces of nature; machine; system of machines having one motor; the machine system having automatic engine. The first four stages of the given periodization received their formation in the primitive period. A simple instrument that has no component parts, appeared millennia before our era, in the early period of the Stone Age (Paleolithic) as a hammer - piece of pebble ...
Essays on Cleaving
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