Bore da i chi Paul,
You asked about “the bells papers that William Wilkins published“. I think you may be referring to the term “bells letters” which is derived from the French “belles-lettres” meaning the finer or more elegant forms of literature. William was described in various census returns as having different occupations from “gentleman” to “author of bells letters”, “literary agent” and “public writer and reviewer”. He authored or edited a number of books. I have details.
I will email you about your fascinating project in which I am most interested.
Hwyl am nawr,