Oh-ho! Was I ever wrong about those bricks having been doubled, wwh! They are most definitely singly laid in the serpentine wall. Drat! I do get frustrated with my visual memory, which is simply too often all screwed up.

But thanks for pulling up the photgraph!

Edit: Ha! Again! It's the same photograph that Flatlander had pulled up! I just opened Flatlander's, which I hadn't taken a glimpse at yet, and there was the same one as yours, wwh!