Found this by accident while looking for something else, didn't read much of it but noticed it has a great list of references at the end, many of which I never knew existed. I'll have to find some of those when I get tiime. He has a number of photos, some of which are obviously replica guns since they are being used by reenactors, but some at National Parks he has pictures of, it isn't clear to me whether he knows they are replicas or not. In almost all case I'm aware of, any 18th C. or earlier bronze cannon displayed outside in the US National Park system (and not locked securely to a monument such as at Yorktown) is a replica. The NPS must have a rule that prohibits original early tubes from being kept outside due to threat of theft etc.
http://americanrevolution.org/artillery.htmlYou can tell that the author isn't a "cannon person" and this may be his first attempt at writing an article about artillery history. There's a lot of good stuff in it but he seems to have uncritically adopted some erroneous things from his references. One example is in the close to the top in the caption of two drawings of some type of old cannon. The author begins his caption thus:
Left, a British 16-pounder, circa 1775, illustrating the different parts.
At the time he mentions, the British had no 16-pounder gun at all as far as I know, that caliber wasn't part of their "system." The drawings are some kind of generic field gun which is closer in appearance to a French or Swedish 4-pounder than anything British.