Surface of leather or rubber and full water in it.
Four sticks and 1 plank.
A metal handle which can be rotated
Inclined fan blade and frame
Metallic frame and cushion
Plastic, metal(stainless steel)
Frame: metal(stainless steel) Cushion: cotton, leather
The average stress
Use four sticks with long length to support a plank to make it stable.
The principle is leverage. Forced to drive through the handle inside the cylinder, to move it to open the lock
Make the flabellum move throughout electricity. Then make the air flow because of the run of different direction of flabellum.
The stability of a triangle and quadrilateral instability
â€˘ References: About.com 2013, About, viewed 14th August 2013 < http://inventors.about.com/library/inventors/blscissors.htm> MrX 2004, Chrome Vanadium Adjustable Wrench, photograph, viewed 14th August 2013, http://upload.wikimedia.org/wikipedia/en/thumb/9/98/Chrome_Vana dium_Adjustable_Wrench.jpg/753pxChrome_Vanadium_Adjustable_Wrench.jpg Winepros Archive 2013, Winepros Archive, viewed 14th August 2013 <http://www.winepros.com.au/jsp/cda/reference/oxford_entry.jsp?ent ry_id=827>