Das ander neuwe vollkommene Fundament, oder neuwer gründlicher, zuvor niemals an Tag kommener Bericht, von allerley Gattung linienrechten Sonnuhren, wie und welcher Gestallt dieselbige ... unfehlbar und künstlich zu machen ...
A 1611 German treatise on sundial construction by Franz Kessler, printed by Wolffgang Richter, for craftsmen and instrument makers who needed exact methods for laying out line-based sundials. The pictures are geometric construction diagrams: sheets of radiating lines, meridian and horizon axes, labelled letters and numerals, and arcs drawn in fine black line on aged paper, offering a designer a clear model of precise radial layout and technical diagramming.
