I don't have a picture, but I'll try to describe what I did.
I took my file folder, a pen, and a ruler. There are to be 11 columns and 12 rows. First, I measured off the columns at the top with my ruler, just putting a small mark (approx. 1.5 in. intervals). Then, I went back and, using my ruler, made a straight line all the way down where each mark was. Next, I did the same with my rows, one small mark every inch. Then I went back and used my ruler to make a straight line where the marks were. It looks kind of like graph paper but larger spaces. Last, I went across the top and wrote down the dates in each column, like this: 1450, 1500, 1550, etc. I hope that makes sense, and maybe someone will be able to come on and post a good picture for you.
