Interesting little booklet, 1894, describing a tour of the Naval Gun Factory and museum, along with a musem catelog. Some of the cannons in the catalog are familiar to me as they are still there, but a number of others are not. At the end there's an intersting description with illustraions of early artillery. In fig. 3, it looks like the artist was confused about the threadng.
http://www.history.navy.mil/library/online/wny1894guide.htm
