What is the gridded glass you look through to draw what you see on graph paper?

Answer 1

It is just something you make for your own use. Get a piece of glass or Plexiglas about 12x12 or 12x16" and if the people who sell it won't smooth the edges, get a piece of emery cloth to take off the sharp edges and corners. Then use a ruler and a permanent marking pen to draw thin lines the appropriate distance apart (like 1"). You will need a support so you can look up at the grid and down at your paper to transfer the intersections.