Über den Betrieb der Hochöfen, Cupolöfen ect. mit erhitzter Gebläseluft : nebst 3 lithogr. Taf.
An 1834 German technical treatise by Carl Friedrich Alexander Hartmann, published by Basse, on running blast furnaces and cupolas with heated blast air, with three lithographed plates for engineers and ironworks men. The two pictures are a red wax seal impression with a standing figure in a pointed oval frame, and a lithographed plate of ironworks apparatus in plan, elevation and section, with a circular wheel-like diagram and small detail drawings. A designer might take from the plate its dense, precise linework and tidy labelled schematic layout, and from the seal its bold red-on-cream mark.
