Mémoire sur les machines a colonne d'eau de la mine d'Huelgoat, concession de Poullaouen (Finistère)
A French mining engineering memoir of 1835 by Juncker, published in Paris by Carilian-Goeury, written for mine engineers and technical readers on water-column pumping machines at the Huelgoat mine in Finistère. Its pictures are a printed cost table of masonry and workings, a folding plate of mine shaft and gallery plans with machine details, and a red wax seal, so a designer might take the precise tabular rules, dense engraved technical plans, and the seal's oval shape with its ornamental lettering.
