Looking at this sheet music of Pietro Antonio Locatelli's "L'arte del violino" Op. 3 we see that the sheet music is pretty old. I have no idea if this is perhaps the original one or not but it does look pretty old. Being an amateur self-taught musician, I am a little confused about some of the music notation here. I am posting an image here of the first page of the first concerto with some markup.
First question, any idea how old this scanned copy is? Could it be the very original one? Or is it much more recent?
Second, about the markups.
- What are those symbols marked in red? My intelligent guess is that they are the sharp symbol but they look like the double-sharp symbol instead. So which ones are they? Were the double-sharp symbols used for the sharp symbols back in the day? Second thing about these, they are not very clear and look like double-crosses. Are they really supposed to be double-crosses or is it just a single 'x' with bad copy editing job/deterioration with time?
- The purple in the last line is just a trill, right?
- The 't' in green, what does that mean? Is that for a trill also? Is yes, then why not just use the same notation as the trill in purple with the appropriate indication of how/which notes to play? How to play this trill?
- What is that 'w' like symbol at the end of every line in blue? It looks like a trill but there is no note underneath it so what does it mean?