Schlegel's ruler's hand book
A 1905 trade handbook by Oscar Schlegel on paper ruling, a printing and ledger-making craft, with its diagrams drawn for ruling-machine operators and stationers. The first picture is a flowing acanthus-and-leaf border with a central rosette, a classic ornamental strip a designer could adapt for frames or dividers. The second shows a patent diagonal ruling sample and a circle-ruling pattern in blue, red and purple, a clean geometric study in line weight, spacing and concentric form.
