To join entrelac squares in such a way that the fabric is reversible is a topic for another post. In this one I'll describe how I make diagrams that show me how and in what order to knit the entrelac squares.
For the Ribbed-Entrelac hat, I figured that I would do five squares at the crown. I probably could have done four squares, but I figured 5 would be more interesting. First diagram is here:
Once I have the squares plotted out, the next thing to do is to show the grain of the knitting. In entrelac, squares that are next to each other have the direction of the knitting at right angles. So, I indicate the grain of the knitting with a straight line that goes through the center of the square(ish) parallel to the direction of knitting. Like this:
Next, I figure out what order to knit the squares in, and indicate the order with numbers on the squares. I place a number in the corner of the square where the yarn enters the square and I place a dot right inside the corner where the yarn leaves the square.
Knitting squares 1-5 is pretty straightforward. Where to place square 6 is the first decision point. It could have gone between squares 1 and 5 rather than as shown, between 5 and 4. The reason I chose it the way I did is related to the way I'm joining the squares (a topic for another post.)
Note that each square except the last in each ring has an odd number of rows, starting on a right-side row and ending on a wrong-side row (for the counter clockwise rings), or the reverse (for the counter-clockwise rings). The last square in a round has an extra row, to double back and start the next ring of squares going in the opposite direction.
Here's the first ring of squares knitted out, and next the first two rings:
Image by fuzzyjay via Flickr
Image by fuzzyjay via FlickrNext time: how I converted this pattern so that each square is replaced by four smaller squares.