As a photographer, I just am thrilled by this photo- a tintype or even a daguerreotype.
It's a photograph from the 1860s. I found it in the Library of Congress online files. I spent a lot of time last year going through the over 7,000 pictures there, looking for ... well, looking for everything I could find that touched on artificers and their work and tools. There really isn't much, as the photographers seemed most interested in taking pictures of officers and dead soldiers. If memory serves, this pic was not one of those taken by Brady.
One of my favorite pics shows a field expedient replacement of the tongue of a limber cart, certainly made by a Union artificer. There are two traveling forges in the picture attached. The near one is as issued, but the tongue on the back limber has been replaced with a sapling, bark still on, just cut to length and trimmed to fit.