I’ve searched the web far and wide, and the only souces I’ve found yet are some introductionary notes to some edition of a work by Descarte and some sparse comments on the Wikipedia article on Neo-Latin, but with that and some living (albeit really dead) examples, this is what I’ve understod so far:
´ is used where the accent is not on the antepaenult and before enclitics, sometimes above the q in -que, sometimes above a q as an abbreviation for -que.
` is used on adverbs and indeclenebilia, i.e. quam the adverb opposed to quam the relative feminine article, and on the præposition a.
^ is used on long vowels, whereelse the meaning would be uncertain, and almost always above ablatives. Sometimes abouve some of the endings in the fourth declension.
& is always used for et, and et in etc. thus &c.
So, dis-moi, how good have I done my homework? Am I wrong in any of my discoveries? Are there things I’ve missed?
Ps. Cœlum for cælum is somehow very, very cute… Ds.