This section is from the book "Text-Book On Domestic Art", by Carrie Crane Ingalls. Also available from Amazon: Textbook On Domestic Art: With Illustrations And Drafts.
Size of sampler 4 by 6 inches.
Overcast all around the edge, using No. 90 cotton with a No. 9 needle. Cut a 3-inch, equilateral triangle in center of goods. Turn under the raw edges 1/4 of an inch, cutting each corner on the diagonal 1/4 inch to make the edge straight. Then place a piece of the same material on under side larger than the triangular opening, and match it to the design on all sides, pinning in place before basting. Hem on right side with tiny, even stitches. Turn to the wrong side, trim off the patch evenly, making a 1/4-inch hem. Hem as on opposite side. Each corner of the patch should be cut and finished alike.
Press on wrong side, and attach name and date.