Civil War-Very Choice Brass Map Glass-Magnifier Used for Map Reading in the Field
As you can see, this glass simple rests on its three legs over a map to magnify the area being viewed and certainly Union soldiers in the field During the Civil War spent considerable time studying all types of maps.
The original threaded section and the brass legs and frame are in wonderful condition and so is the glass; I tried it scanning historical photos and it is just a good as any glass you would use for the same purpose today as for what it was made 150 years ago.
You can see the threads that allows movement of the upper portion with the lens, I know for removing it, but I assume it also allows the user to adjust the focal length when using it.
Like nautical antiques, Civil War items in brass (especially in this state of excellent preservation) are especially nice for display. In recent years I sold a bass telescope that would have made a terrific companion to this piece. Officers' field items, traveling desks and other items are, in my opinion, some of the most attractive and displayable Civil War items.