A. Payen's Gewerbs-Chemie : ein Handbuch für Gewerbschulen, wie zum Selbstunterricht für Gewerbtreibende, Kameralisten, Landwirthe etc
A German-language chemical technology handbook by Anselme Payen, edited by Hermann Fehling, published in Stuttgart in 1850 for trade school students, self-learners, and craftsmen. Its pictures are plain black-and-white engravings of furnaces, retorts, and apparatus in cross-section, useful to a designer wanting clear mechanical diagrams with hatched walls and labelled parts.
