(I know they are elephants but the handles on top of a cannon are called dolphins no matter what species they look like).
It is my personal opinion, that all encompassing statements of supposed fact such as this, sometimes puts a person in the awkward position of having to attempt to defend a basically undefendable position.
This brings to mind the admonition to DD about the improper use of the word wedge, as opposed to the proper use of the word quoin; while in reality it's a very easy task to find a number of books authored by respected writers on the subject of artillery that indeed do use the word wedge.
We now find ourselves in the same type of situation; I can start with the Mehl book because it's close at hand, and proceed to continue to fashion a downward growing column of books on ordnance, where the authors use the word handles instead of dolphins. When the objects depicted in the handles have nothing to do with sea creatures, I myself prefer that the term handle be used, because calling them dolphins seems to me to be like an oxymoron.
John, I don't mean this post to be confrontational, and I'm also not trying to be a smart-_ss; I just wanted to make my position on this matter clear, and I genuinely think it's the correct position to hold (at least on this matter).