3. Ruler - Deepstash
3. Ruler

3. Ruler

  • Made of ivory, the oldest ruler was discovered in the Indus Valley civilization and date back to the year 1500 BC.
  • The subdivisions of the decimal system are surprisingly accurate.
  • One such specimen was even calibrated to 1/16 of an inch—less than 2 millimetres.
  • These kinds of rulers were clearly very prominent, as even bricks of the valley’s buildings were found to follow the same measurements. 

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