How Machines and Tools Help Us
•
9mins
Demonstrates that man has devised ways of making work easy with the aid of simple tools, engines and motors, and by harnessing such natural forces as wind and water.
How Machines and Tools Help Us
•
9mins
Demonstrates that man has devised ways of making work easy with the aid of simple tools, engines and motors, and by harnessing such natural forces as wind and water.
