Civil engineering classmates, do you know what day is it today?

Today is 13th June, 2016. Few chinese people knows the meaning of this day. It origins to an ancient person in A.D. 507-444. His name is Luban. His family name is Gongshu, and given name is Ban. He was born in Lu country, so people call him Luban.  His father was a craftsman and he did learn this craft with his father in his childhood. As he practised so much that he had a lot of experience in the civil engineering. 

Luban is the ancient excellent inventor and is respected by many chinese craftsman.   And many tools used today are invented by him. Let us have a look. 

1. saw

2. Bevel gauge

3. Carpenter's ink marker

4. Lock-and-key

5. Scaling ladder

6. Strong hook

7. Stone mill

8. Wooden kite

9. Umbrella