Title: Lettre sur les éléments de la gravure à l'eau-forte (Letter on the Elements of Etching)
Object type: Print; Portfolio
Date: 1864
Artist:  Adolphe Martial Potémont, called Martial 
Artist bio: French, Paris 1828–1883 Paris
Artist nationality: French
Artist role: Artist
Medium: Etching
Dimensions: Frontispiece: 7 15/16 × 6 7/16 in. (20.1 × 16.4 cm)
Image (of each inside plate): 11 9/16 × 7 7/8 in. (29.3 × 20 cm)
Classification: Prints
Credit line: The Elisha Whittelsey Collection, The Elisha Whittelsey Fund, 2023
Department: Drawings and Prints
Repository: Metropolitan Museum of Art, New York, NY