I just added the below image and entry to the post, Serpent & Ophicleide: History and Images. It’s from a French dictionary by Eugene-Emmanuel Viollet-le-Duc that is in the public domain.

1858-1875—France: An engraving by Guillaumot of a serpent appears in the French dictionary, Dictionnaire raisonné du mobilier français de l’époque carlovingienne à la Rénaissance (see below image; public domain).