From: Geoff_Howlett.BioChem@muwaye.unimelb.edu.au
  To  : rasmb@bbri.eri.harvard.edu
  Date: Fri, 14 Jul 1995 10:59:01 +1000

...no subject...

The XLA generates such interesting data its tempting to say if its not 
broken, don't fix it.  I recently had the experience of having the light 
source cleaned with toothpaste.  The resulting improvement in the quality 
of the data was a joy to behold.  Thanks to Jim Russell for his help and 
for reminding me that even good machines need maintenance.

While its a bit embarrassing to admit to the above I mention it in case 
other machines might also be showing signs of wear.  The occasion suggests 
there ought to be a simple test to check how machines are performing.  A 
wavelength calibration is one possibility.  Could the noise (at say 280 
nm) in the air versus air region provide a convenient marker?  What do 
others do?

Best wishes

Geoff Howlett