54
ON SOUND.
which is maximum + when v =0, is + till v = — when
4
it vanishes, is — till v' = — when it is maximum —, is
A
3 jß
— till i/ = — when it vanishes, and is + till v=B when
it is maximum +.
Therefore the formula of Article 32 will give the fol¬
lowing as shewing the nature of the principal alterations
in the values of X ;
when v = 0,
X=