About two weeks have passed in Berlin.
Yesterday, in the Staatsbibliothek, I happened to find a letter of D. Bernoulli,
which contained an interesting passage for the history of mechanics
(although it's not relevant with my present study...).
This is the only new material I've found so far, and in order to use it,
it seems better to consult a series of materials in the Academy archive.
Apart from that, I also want to look into some books housed in the S-B
(which seem to be not available on the Internet yet).
Perhaps I've got convinced, at last, what I should do here.
It's certainly very late, but I have one more week.