Mary M. Atwater's article explains summer-and-winter weave on six harnesses: its probable Pennsylvania origin, the name, and why it is more durable and more flexible in block size than overshot. It describes the unit structure (two tie harnesses plus pattern harnesses), the short-draft notation, tie-ups, treadling "one and one" and "in pairs", yarn choices and sett, and weaving in several colors. Three diagrams give a simple diamond pattern in short and expanded drafts, a Colonial pattern with variant tie-ups and treadlings, and pattern #46 from the Speck manuscript.