Removing time signatures (yet again!)

[Bob Harvey]

Hi,

Please forgive my limited understanding of musical notation and scoring -- I am 
very new to this whole area, so my use of terminology might be clumsy or 
incorrect.  I have explored several of the different approaches, that I have 
found in these lists, to removing the time signature.  However all the ones I 
try work OK if you only have one stave, but not if you have two (a treble and a 
bass clef).  So, the script below works to remove the time signature for the 
treble clef stave, but not that for the bass clef.  If you remove the comment 
above the bass clef stave it parses OK but produces something quite odd (to my 
eyes, anyway) and certainly not what I expect or desire.

\version "2.10.5" 

\relative c 
 { 
 << 
   \new Staff 
      \once \override Staff.TimeSignature #'stencil = ##f 
      {  \clef treble  \partial 4 d' } 
   \new Staff 
%      \once \override Staff.TimeSignature #'stencil = ##f 
      { \clef bass \partial 4  f, } 
 >> 
 } 

What I want to get is exactly as this script produces, yet without the time 
signature for the bass clef.  Hope someone can help.

Regards, Bob.