Ultramarin
Ultramarin is a technical handbook on the manufacture of ultramarine pigment, written by Reinhold Hoffmann and published in Braunschweig by F. Vieweg in 1902. The pictures are plain line drawings of furnaces and kilns in sectional and plan views, with labelled chambers, flues, and arched openings. A designer might take from them the geometry of industrial plant drawings and the dense hatched shading used for brick and masonry.
