accidentals in nocturne op 9 no 2 question

[itzik0525168]

hi,
i start learning the piece and i want to know about local accidentals.
they relevant for all the measure? as long as there isn't natural (♮)

[dogperson]

I have never heard the term 'local accidentals'.   In Chopin 9, No 2, the key signature indicates that all E B A are flat, unless otherwise marked in the score. In measure 2, there is a natural sign prior the first E in the bass clef.  That means that all E, on the same line in this measure will also be natural, i.e., not flat as per the key signature.   

The E with a natural sign is called an 'accidental', because it is a difference from the key signature.

[itzik0525168]

still working on my english
ok. thanks

[frege]

still working on my english
ok. thanks

Lol I actually think local accidental makes a lot of sense and wouldn't be a bad proposed naming convention. It's a bit like local vs global/absolute in computer science. Local accidental could be one acting for a bar whereas a global accidental could be one in the key signature.

[timothy42b]

 That means that all E, on the same line in this measure will also be natural, i.e., not flat as per the key signature.   

This is true but some editors are careless about octaves, they don't always follow the convention.