Afternoon tasks:
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The DA checked out fine, but we have used the same tapes for several nights now. 
If there was much of a chance for imaging tonight, I would have changed them
for fresh tapes. I suggest we switch to new tapes tomorrow.

Imager, spectrographs and engineering camera all checked out okay. Arc & flat
field lamps okay. 

PT: biases, dome flats done.


Night log:
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We did not get on the sky.

Rain nearby at sunset followed by inclement weather on site kept us closed until about 02:35, 
when we tried to open under a clearing sky.  However, while filling the spectro dewars after
opening, the dewpoint once again dropped below 3C, so we closed immediately.  Minor dampness
was detected on a few surfaces, but quickly evaporated inside the enclosure.  

We used the test version of IOP/SOP, v3_53_5.  This is still the desired version, but has yet
to be tested with the spectrograph and imager on the sky, so we have not declared it current.
If it becomes necssary to revert to the current version, v3_50_4, then we will have to also 
revert to writing log files by hand.  Note that the IOP servers must be restarted under the 
test version before each night's work.  

We were interviewed and filmed by a reporter from Channel 7 TV News in Albuquerque, in 
connection with the observations of the Gunn-Peterson effect in the z=6.28 quasar spectrum in 
particular, and the SDSS in general.  

We worked on getting a good set-up on the 'cinerama' 4-monitor observers' workstation (a.k.a.
landru) to good effect.  Landru will certainly make the driver's job easier when we do, 
eventually, get on the sky.  Eric made progress with installation of the SDSS software products
on landru, as we eventually  hope to run at least watcher, astrotools and astrom on that machine. 

We had one unexpected logout of the observer's session on landru, which we think we traced to an
'autologout' event in the parent shell - users should put "unset autologout" in their .cshrc 
files.