Size of Board.
To get these proportions take a piece of charcoal in your hand and stand at arm’s length from the wall, with your right side toward it, and without changing your position, or leaning forward, make a mark as high upon the wall as you can reach. In the same manner make a mark as low as you can reach, without stooping. Swing your arm from left to right, make two marks midway between and upon each side of the first marks. This will give you the full extent of your reach. It is well to allow a foot more, each way, for a margin. This will give the proper proportion for the drawing-board.
The board must be made of soft, smooth pine boards, so matched that there will be no cracks to annoy you while drawing.