The highest point of a transverse wave is called the CREST, while the lowest point of a traverse wave is called the TROUGH. Added 186 days ago|4/18/2015 2:58:34 PM. This answer has been confirmed as correct, not copied, and helpful. Confirmed by yumdrea [4/19/2015 4:18:08 PM].
The jointer plane (also known as the try plane or trying plane) is a type of hand plane used primarily to straighten the edges of boards in the operation known as jointing. A jointer plane may also be used to flatten the face of a board.
They can make one surface of a board straight. They have a long table (the longer the better). http://en.wikipedia.org/wiki/Jointer A planer (thickness planer) will make one one surface parallel to the opposite surface. The problem is if that if the opposite surface is not flat the one you are milling will not be either. You need one flat reference surface (what a jointer gives you).