Step 1.  In the center of the page, draw a 4 inch vertical (up and down) line.  Now measure 1 inch and make a small mark.  Now draw a 4 inch horizontal line (side to side) with one inch on each side of the vertical line.  

Step 2.  Make a small mark at each 1/4 inch measurement across the length of each line starting where the lines cross.

Step 3.  From the top of the vertical line and going to the left, draw a straight line down to the mark closest to the center on the horizontal line.

Step 4.  Move down the vertical (up and down) line to the next mark.  and draw a line to the second mark moving away from the vertical line.  Continue moving down the marks until the entire left side is connected.

Step 5.  Follow this process for the other three sides of the drawing.