Title: Lampes docimastiques, inventées par T.P. Bertin ... .
Description: A publicity sheet issued most probably by the inventor Bertin for his lamp used for soldering and metallurgical analysis. A similar sheet entitled "Lampes docimastiques, ou fontaines a feu, inventées par Théodore-Pierre Bertin" has "chez citoyen Bertin" and "chez citoyen Berthé" and therefore most probably predates this one.
Subjects: Metallurgy, Early works to 1800, Instruments, Metallurgical analysis, Solder and soldering