Abstract
We often draw an orthogonal projection on section paper. In this method, we do not need to use any scale.
In such a manner, we studied the method to draw an axo-metric projection on section paper or ruled paper.
As the result of study, direction of three axes relative to ruled lines are found. A straight line parallel to each axes intersects the ruled lines in a unit length.
Ratio of three unit lengths is simple. Then, we can measure the length in these unit lengths.
