Indentation for second page of score

[Doug Asherman]

Hi:

I'm working on an orchestral score, where each staff is set up like so:

\context Staff = staffname {
  \set Staff.instrument = "Long Instrument Name"
  \set Staff.instr = "Short instr. nm."
  \instrument
}

Things look pretty good on the first page -- the instrument names print 
out with enough indentation, etc. On the second page, the indentation is 
0 (as far as I can tell) and the beginning of the instrument name is cut 
off.

I _think_ I saw a property that handles indentation on the second and 
succeeding pages, but I can't recall what it was or where I saw it.

Any pointers would be appreciated.

Doug