4.5 inches wide (when finished) by 5 feet long, which means:  knitted 36 stitches wide by 360 rows long, with alternating 30-row sections of color A and color B

Knitting the scarf:

• Hang weighted hem on 36 st.
• K 1 row ravel cord.
• K 6 rows WY.
• Set row counter to 000.
• Leaving about a 24" yarn tail at the beginning, K 1 row MY, color A.
• Using 1-prong tool, move the 2nd st from each edge onto the 3rd ndl from each edge.  Push the now-empty 2nd ndl from each edge back to NWP (these are ndls 2 and 35 if you started with ndl #1).  These ndls will stay out of work until the very end of knitting the scarf.
• K 29 rows MY, color A.  Cut yarn, leaving a tail a few inches long.  (Attach a clothespin to this tail to weight it for the next few rows.)
• K 30 rows MY, color B.  Cut yarn, as with color A.
• Repeat 30 row sections, alternating colors A and B, until RC = 359 (you should now be using color B).
• Put ndls 2 and 35 back into WP.  Pick up purl bumps from under sts 3 and 34, and place them on ndls 2 and 35 so all ndls are now back in use, and you are working on 36 sts again.

• K 1 row MY, color B.  Cut yarn, leaving about a 24" yarn tail. Attach a clothespin.
• K 6 rows WY.
• Remove work from machine.

Finishing the scarf:

• Tie all the pairs of yarn tails at color changes in secure square knots and trim to 1" or so.
• To finish the short ends of the scarf, you will graft them, inside out, on the machine.  Here's how:
  • Push forward 18 ndls.
  • Working on one end of the scarf, fold it inside out, hold it with the fold at left, and hang two MY sts on each of the 18 ndls as follows:  Thinking of the sts as if they were numbered 1 through 36, working from right to left, hang sts 2 through 19 on the 18 ndls; then hang st 1 on the same ndl as st 2, and working from the other side, hang sts 20 through 36 on the remaining ndls.  This is simpler than it sounds--it just means you end up with the point where the long edges of your scarf meet on one flat side of the scarf, instead of at the very edge.  See the diagram at top right.  Leave the WY on your work for now to make it easier to see the sts.
  • Using the long yarn tail, graft the end sts together.  For a very good illustration of how to do this, go to http://www.magiccables.com/tip2.html.
  • After you finish grafting, remove the work from the machine and remove the WY.
  • Repeat the process for the other end of the scarf, making sure you hang the stitches so the long edges meet on the same side of the scarf as on your first grafted end.
• To finish the long edge seam on the scarf, you will use the crochet hook "lace-up" method.  Because your 2nd and 35th ndls were out of work for most of the scarf, you created extra-long edge stitches that will be laced together to make a subtle, flat seam.  It's not invisible, but it's smooth and looks nice  See photo at bottom right.   Here's how to sew the seam:
• Lay the scarf in your lap, folded in half with right sides out and the edges to be joined next to each other. 
• Insert a crochet hook from the outside (which is the right side) into one edge strand of the first long stitch (you will see alternating longer and shorter stitches on each edge) on the edge of one side of the scarf. 

• Then insert the hook, again from the right side, into one edge strand of the first long stitch on the edge of the other side.  See photo at middle right on page 2.  Pull this long stitch strand from the second side back through the long stitch strand on the first side.  You now have a loop from the second side on your hook. 
• Put the hook into the second long stitch on the edge of the first side, and pull it back through the loop from the second side. 
• Continue in this manner all the way to the end of the two sides, making sure that at each color change, both sides change colors at the same time!  (If you need to fudge a little by taking a stitch in a small loop to make the color changes come out even, do so!) 
• When you get to the end of the scarf, use your hook to pull the yarn end waiting for you at that end of the scarf into your last loop, then weave the end in to finish. 
• Always insert your hook from the outside (the right side), always into a single strand of a long stitch (except for an occasional fudge), always alternating sides. 
• When the long seam is done, weave in any remaining ends (there shouldn't be more than one or two), then gently but firmly s-t-r-e-t-c-h out the whole scarf, pulling on the seamed long edge, to loosen up those long edge stitches that you seamed together. 
• Wash and dry the scarf for softness, and wear your colors (whatever they are) proudly!