Catalog mathematischer Modelle für den höheren mathematischen Unterricht veröffentlicht durch die Verlagshandlung
A 1903 trade catalogue of mathematical models for advanced university teaching, compiled by Martin Schilling and issued by a publisher in Halle an der Saale for mathematics instructors. The four pictures are line engravings of physical models: a warped twisted surface on a base, a helical double-coil form on three rods, and a wire-framed lattice with curved struts, all drawn with fine hatching that a designer could borrow for technical line work.
