Gear
Unsung hero !
A machine can be disassembled into various parts. The gear is one of the parts which cannot be further disassembled. Many kinds of gear exist and here you can find 5 types of gears.
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What an old history!
The gear has a very long history. One theory says that the wooden gear has been used since ante-Christum in Greek and Egypt as a machine to draw water. -
Nature of gear
The gear surely comes back to the original position after a rotation. As gear works "certainly" and "reliably," it is used in many parts of the precision machine. -
Where is a gear hiding?
Do you know a gear design is incorporated in something you daily use? Look at the front center of 5 yen coin made in 1949 and after.
