I don't use the gridding method in my work but on those occasions when I prefer to be just a lazy artist this kit helps make fast work to create my line drawings of any subject. This kit advertised on the Company's website includes a variety of white gridded transparencies, some of which hold 2 or 3 different sizes per transparency. These can be trimmed to divide the grids into individual sheets for easier application. Sizes range from 2x3, 4x6, 5x7, 8x10, 9x12 and 12x14 etc., and provides the artist with any size imaginable for creating artwork that is accurate and true.
The kit includes a ruler (which is just a piece of cardboard marked off with letters A, B on one side and C, D on the other side) and which is further marked by black and red arrows along the edge for the length of the ruler. By selecting a grid size, you then refer to the chart which is included, to coincide with either A/B or C/D measurements. Black or black/red combination arrows work as a guide to allow you to quickly create a grid on the medium you're using. Tape the acetate grid to the referenced photo/image. Then simply duplicate the squares using the proper measurment indicators on the ruler, on the medium of your choice (paper, canvas etc). Letters starting with A are assigned to each square running across (horizontally), and numbers beginning with 1 are assigned to each square running down (vertically). These are your coordinate points and should equal those on the acetate grid. All that's left to do is to create your line drawing using each square of your reference material as a guide and drawing the details from each into the corresponding squares on your medium.
Once your image has been transferred, you can refine your work to your liking. If using pencil crayon you'll want to erase the grid lines on the medium before coloring in order to avoid smearing of the graphite lines.
I'd recommend this for artists just starting out more than the accomplished artist who already has good visual perception. It fits the purpose as a tool for making accurate line drawings of almost any image/photo or even things like still life, portraits etc. The grids can be taped to a frame or other support material that is able to stand on its own to allow for accurately drawing still lifes, portraits, etc. and is then transfered square by square as above.
Extremely detailed renderings can be achieved using this system and incorporating more than one size grid. Over all it's a very straight forward system that helps the artist to create very accurate likenesses of their subject. Except for the expense, this is a quick and easy way to work with grid systems and using these allows anyone to be an accurate artist.