Setting staff size for a single book

[Sandro Santilli]

According to the manual [1] you can use #(set-global-staff-size 14)
in a book block, but when I try (using lilypond 2.18.2) the output
does not change. Example:

  \version "2.18.2"
  \book {
    #(set-global-staff-size 48)
    \header { instrument = "Bass" }
    \score {
      \new Staff { \absolute c' }
    }
  }

Moving the #(set-global-staff-size 48) line *outside*
of the `\book` block works fine. Is it a bug in the manual
or in the code ?

[1] http://lilypond.org/doc/v2.18/Documentation/notation/setting-the-staff-size

--strk;