Blank Staves

[Tim Hucker]

I'm trying to print a page of blank staves in Lilypond 2.4 under Windows XP.

My file (at the bottom of this post) nearly does the job, but
(i) the bar numbers resolutely remain, despite the "remove
Bar_number_engraver" instruction, and
(ii) putting noindent in restores the time signature, clefs and barlines.

What am I doing wrong?

TIA

Tim

emptymusic = {\repeat unfold 11 { s1\break }}

\new Staff \with {
defaultBarType = #""
\remove Bar_number_engraver
\remove Bar_engraver
\remove Time_signature_engraver
\remove Clef_engraver
                }
{\emptymusic}