Simple and Practical Draughting System. You may now draw straight , parallel lines without a ruler or drawing board. Simply place normal photocopy or writing paper over the plastic sheet of the Technical Drawing System, and using any hard tipped pen or pencil, draw a line horizontally or vertically anywhere on the paper. The lines you draw will be perfectly straight. Now you need a line at an angle, simply move the paper to the angle of your choice (marked on the plastic sheet and draw your angled line.

The specially manufactured PVC plastic sheet is grooved horizontally and vertically at exactly 1mm spaces to accomodate the tip of any pen or pencil. When a line is drawn on the paper which is placed on top of the plastic sheet, the pen or pencil is guided by the grooves and the line is drawn perfectly straight.