|DRAWING SKETCHING COURSE: "Optical measuring" of angles|
This is an online drawing course free of charge.
When drawing it is really difficult to estimate, how long lines have to be drawn, which in reality “run away” from the draughtsman and which therefore appear foreshortened. Perhaps even more difficult is to estimate the angle, in which this lines should be drawn. In this case the optical measuring procedure with a pencil, stick or brush helps again.
As described before the pencil is hold with stretched arm, one eye shut. When untrained, the pencil is hold intuitively spatial parallel to the line, which has to be measured.
Now you concentrate to the pencil and force yourself to bring the pencil into a right-angled position to the arm, covering the line, you want to measure.
When the pencil is covering the line and is posed in the correct way you don’t fix the motif any more, you now concentrate on the pencil. The pencil is in the plane right-angled to the axis of your eye, and it has the same gradient like the line, you want to draw.
The cabinetís edge is to be drawn . Arm and brush are photographed from the view of the draughtsman. First he closes one eye and covers with the brush the edge, he wants to draw. Intuitively he will put the brush also spatially parallel to the edge.
Now he brings the brush into the plane parallel to the faces plane. That means, arm and brush are right-angled. He controlls, whether the brushstick is still covering the edge. Then he marks the length of the edge with his thumb. To see how to measure the length of lines look the page before.
Now he concentrades on the brush, without paying any more attention to the motif itself. When looking to the brush the background is vanishing. Looking at the brush it is very easy to estimate the increase. The frame marks the detail of the picture which is to be drawn, it marks the drawing paper.