where \ is a left-leaning decrease. On the rare occasions where a left-leaning decrease is found in the patterns in this sample book, sl1 k1 psso is always the version used.
You can download the full-size chart, verbal instructions and notes here.
Tweaking the Pattern
The absence of balanced decreases is notable. Left-leaning decreases (SSK, sl1 k1 psso, K2tog tbl, et al.) are rare in 19th Century patterns, even in a symmetrical design like this one where they could be expected. A modern designer would likely use opposing decreases on each side as the center diamond grows and then reverse the order as the diamond tapers, like this
Next week: Knitted Trimming