Manual training: cardboard construction
A 1902 manual-training textbook on cardboard construction by John Herman Trybom with Ellen Frances O'Connor and Abbie Ellen Wilson, published by Milton Bradley in Springfield, Massachusetts for schoolteachers and their pupils. The plates are line-drawn cutting and folding patterns: rectangles and gabled shapes ruled with solid cut lines, dashed fold lines, arrowed dimension bars and handwritten fractional measurements in inches.
