Trombone
I just added the following to the 19th century timeline (1st half) and to the post Serpent & Ophicleide: History and Images.
1833-1900—Turnhout, Belgium: A catchpenny print entitled Harmonie, probably published by Glenisson and Van Genechten, features musicians playing various instruments, including a buccin (trombone with dragon-head bell) and a standard trombone (see below detail; public domain) (Catchpenny Prints of the Dutch Royal Library).
I just added the following image and caption to 19th century timeline (1st half) and to the HubPages article, Backward Advances: Rear-Facing Trombones Throughout History.
1820-39—Rotterdam, Netherlands: A catchpenny print by T.C. Hoffers and A. van Alphen depicting various military instruments includes 2 rear-facing trombones, one with a dragon bell (see below detail; public domain) (Catchpenny Prints of the Dutch Royal Library).
I just added the below image and caption to the Trombone History Timeline (16th century).
1581—Dresden, Germany: A quartet of 3 strings and a trombone is depicted by artist Friedrich Bercht as part of celebrations surrounding the visit of Archduke Charles of Austria to Dresden (see below image; public domain) (Dresden, Sächsische Landesbibliothek).
I just added the below entry and image to the 19th century timeline (2nd half) and to the blog post, Serpent & Ophicleide: History and Images.
1865-1916—Netherlands: A painting by artist Willem Constantijn Staring (1847-1916) depicts bandsmen of the 9th Regiment Infantry, including a pair of trombonists and a musician playing a green-colored serpent (see below image; public domain).