Mathematical wrinkles for teachers and private learners, consisting of knotty problems;mathematical recreations; answers and solutions; rules of mensuration; short methods; helps, tables, etc.,
A 1923 Nashville collection of mathematical puzzles and recreations by Samuel Isaac Jones, written for teachers and private learners. The pictures are plain line diagrams in black ink: a square dissected by diagonal lines, a triangle with dashed construction lines meeting at a centre point, two overlapping circles joined by a chord, and a railway track junction with labelled regions. A designer might take their clean geometric linework and labelled diagram layout as a model for technical schematics.
