Could anyone tell me which way to turn the screws on a tune o matic bridge to adjust the intonation to make the note flatter?

the problem is that below the 12th fret most of the notes are sharp but those above are fine. The 12th fret harmonic is also ok.

Thanks in advance for any help

(if this should be in electric guitar let me know)
Quote by Zangetsu 101
Girl (Ned/chav) annoying me on the bus.

Me "Have you ever bled out your arse-hole?"

Her: Facial expression was priceless - "What??! Noo!"

Me: "Well if you want to keep it that way, **** off."

She then turned away and whimpered.