The National Geographic Magazine, Volumes 98-99National Geographic Society, 1951 - Geography |
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Page 61
... that stage in the progress of man which extends from the end of the Stone Age to the beginning of the Copper Age proper . This period , in which copper was used sparingly together with stone , lasted perhaps 2,000 years ...
... that stage in the progress of man which extends from the end of the Stone Age to the beginning of the Copper Age proper . This period , in which copper was used sparingly together with stone , lasted perhaps 2,000 years ...
Page 65
The Introduction of Copper Ushers In a New Era T * HROUGHOUT the Chalcolithic , or Stone - Copper , period wares . important , was treated in much the same way as stone . The real age of copper could not set in until the discovery of ...
The Introduction of Copper Ushers In a New Era T * HROUGHOUT the Chalcolithic , or Stone - Copper , period wares . important , was treated in much the same way as stone . The real age of copper could not set in until the discovery of ...
Page 580
580 Gang Saw , Shaping Sharpening Stones , Cuts Hard Rock into Breadlike Slices Norton Pike Company , Littleton , New Hampshire , makes stones to whet Latin ... They slice this Arkansas stone at half an inch an hour ( page 584 ) .
580 Gang Saw , Shaping Sharpening Stones , Cuts Hard Rock into Breadlike Slices Norton Pike Company , Littleton , New Hampshire , makes stones to whet Latin ... They slice this Arkansas stone at half an inch an hour ( page 584 ) .
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