Carpenter's square
A carpenter's square (also called an angle iron ) is a measuring tool for marking and checking 90 ° angles in timber construction . It is also used to transfer cracks from the drawing floor to wood. The carpenter's square is laid out with the long leg on the longitudinal edge of beams and timbers in order to mark 90 ° sections with the short leg. In addition, most carpenter's squares have oval holes 5 mm apart on the short side so that you can use a carpenter's pencil to mark cracks parallel to the long edge. The two legs arranged at right angles are usually 3.5 cm wide. In addition to carpenters , it is also used by other craftsmen.
Alpha angle
An alpha square (or alpha scribing device) is a special form of the carpenter's square. Another bracket is rotatably attached to a carpenter's bracket. This angle can be set between 0 ° and 90 ° using a scale. This set angle can now be used to mark the rafters , a tearing floor is no longer required. A bevel is used without a scale .