People from Indus valley are believed to be the first to invent a system of weights and measures. Their smallest division was 1.704 mm. Decimals were used for all purposes. The bricks they used had a ratio of 4:2:1. The people of Indus valley invented an instrument for measuring the horizon and the tidal dock. The people of Harappa made new techniques in metallurgy and they produced copper, lead, tin, and bronze. They also had the knowledge of gold testing.
Mud-brick wall from the Indus city of Harappa.
http://www.bbc.co.uk/schools/primaryhistory/indus_valley/technology_and_jobs/
Mud-brick wall from the Indus city of Harappa.
http://www.bbc.co.uk/schools/primaryhistory/indus_valley/technology_and_jobs/
Copper was used by the Indus Valley people to make weapons.
http://www.bbc.co.uk/schools/primaryhistory/indus_valley/technology_and_jobs/
http://www.bbc.co.uk/schools/primaryhistory/indus_valley/technology_and_jobs/