US Patent No. 466,566, granted January 5, 1892 to Caspar J. Jenny of St. Gall, Switzerland, assignor to Strauss & Co. It describes a chain-stitch embroidery made of two layers of chain-stitches worked on the front and back of a light fabric, with the patterns crossing and interlocking. The ground fabric is then destroyed with acids, leaving a lace-like embroidery for curtains, tidies and covers. Four drawing sheets show the individual stitch layers, a section view, and a sample pattern as front, back and combined stitch lines.