I've posted this question over on Weaving Today, but the forums seem eerily quiet, so will try for help here, as well!.
I have never tried log cabin or shadow weaves before, and thought I understood the draft I was using, but something is very wrong somewhere!
I've been weaving some test samples, and tried a repeat of the log cabin runner with supplementary warp shown on pgs 58-61 of the Handwoven May/June 2000 issue. I followed the threading, tie-up, and treadling diagram given (Figure 2, at top in the photo below), without the supplementary warp. I treadled from bottom to top, and I am using a 4-shaft counterbalance loom. While I know this can reverse the weaving, the other side of the fabric looks much the same.
My sample shows no weftwise lines at all, just warpwise columns and shorter checkerboard-like bands, with no visible block transitions. The illustration of the thread-by-thread drawdown, as well as the photos of the runner itself show strong horizontal lines and narrow vertical columns. My sample (see attached) looks nothing like it. Ignore everything to the left and above, where another threading for a different sample is just being carried along, and I have been sampling other yarns in tabby, respectively. The upper part of the log cabin sample section is pinker because the narrow pink weft is tripled (as it is in the warp); in the lower section, this thin weft is used singly.
Have I missed some important feature of the threading and/or treadling? I understood the thread-by-thread illustration and the threading/tie-up/treadling diagram to be representing individual threads, as for other weave structures - an alternative presentation to the block profile draft also shown.
Any advice would be greatly appreciated!