Part 3 - On to the heel shaping!
Follow the chart until the sole side of the sock measures approximately 6.75 inches for the small size, 7.5 inches for the medium size, and 8.5 inches for the large size. End on an even row. This pattern assumes a high arch. If you have low arches, work the chart 0.5 inches less than the measurements given above.
Click on the image for a full size version of the chart.
Abbreviations
RS: Right side of sock
WS: wrong side of sock
k2tog: knit 2 stitches together knitwise
p2tog: purl 2 stitches together
ssk: slip 1 knitwise, slip 1 knitwise, place back on left needle and knit through the back of the loop.
ssp: slip 1 knitwise, slip 1 knitwise, place back on left needle and purl through the back of the loop. It is a bit tricky, but worth it.
Heel Shaping
Use only the stitches on the sole needle(s). If you are using double pointed needles, you may want to put all the sole stitches on one needle. Start on a wrong side (WS) row as follows:
(WS) slip 1 purlwise, purl until 2 stitches remain on the left needle, turn work.
(RS) slip 1 knitwise, knit until 2 stitches remain on the left needle, turn work.
(WS) slip 1 purlwise, purl until 4 stitches remain on the left needle, turn work.
(RS) slip 1 knitwise, knit until 4 stitches remain on the left needle, turn work. Continue in this manner until you have 10 heel stitches remaining unworked, ending on a RS row. There should be 10 stitches on each side of the heel stitches. Turn work.
Now we need to incorporate these stitches. You should be on a WS row.
(WS) slip1 purlwise, p8, ssp, p1, turn work.
(RS) slip1 knitwise, k9, k2tog, k1, turn work.
(WS) slip1 purlwise, p10 , ssp, p1, turn work.
(RS) slip1 knitwise, k11, k2tog, k1, turn work.
Continue in this manner until all the stitches have been incorporated. There will be fewer stitches now than when you started the heel shaping. You should have 20 heel stitches.
The heel shaping isn’t quite complete. We still need to incorporate some of the stitches from the instep needle(s). Shift 6 stitches (3 from each side of the instep stitches) from the instep needle(s) to the sole needle(s). You will now have 34 stitches on the instep needle(s) if you are on rows 75 - 79, 35 stitches for rows 81 - 95.
Start with the first heel stitch (yes, you do need to slip some of the stitches you just shifted to get to the heel stitches).
(WS) slip 1 purlwise, p18, p2tog (incorporates one stitch), turn work.
(RS) slip 1 knitwise, k18, ssk (incorporates one stitch), turn work.
Repeat both rows one more time. There will be a gap between the remaining unworked stitch and the heel stitches, make 1, this will tighten up that spot.
You should now have 24 sole stitches and 34 or 35 instep stitches. If you are using double pointed needles, go back to 2 needles for the sole stitches. You will resume knitting in the round.
Start the Leg
Continue working the chart as shown. It will be the same as on the foot with one exception. The patterning will not end at the edge of the instep stitches. Now you will shift the patterning around to the back of the leg and toward the centerline of the back of the leg.
ETA: a chart that shows what happens at the back of the leg. As Always, click for a larger picture.
We are almost done! The last part will finish the sock.
Notes on the chart. I trimmed off most of the foot to make it a manageable size. the horizontal line indicates where the last chart left off. The variable stitch count depends on where you start the heel. Before the heel turn it is the larger number, after the heel turn it is the smaller number.