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The GraphGrid frame
Detailed description
The GraphGrid frame is yellow with a thickness of four milimetres. It is placed on the TactiPad like a picture frame. Eight oval holes in the frame fit around the knobs of the TactiPad to hold it in place. Three of the four corners are rounded.
Along the inner edge, small curved hooks are placed at a regular interval of 1 centimeter. Along the outer edge of the GraphGrid, indentations are made with a spacing of 1 centimeter as well. Slightly wider indications mark 5 centimeter intervals. The indentations hold rubber bands.
The locations of the hooks and indentations both exactly match with the centimetre scale along the edges of the TactiPad.
The ‘graphing paper’
The measurements of the drawing board become tangible on the entire drawing surface.
The frame overlaps the drawing surface along the edges by one centimeter.
Because of the A4 dimensions of the drawing surface (29.7 cm by 21.0 cm), the centimeter scale is not symmetrical along the TactiPad. Therefore the starting point for horizontal and vertical distances is at the upper left corner of the drawing board and GraphGrid frame when in landscape orientation.