MDM Trouble Report for 2002 Feb 7

Telescope: 1.3m
Observer(s): Burke (OSU)
Instrument: Echelle

Problem(s) Encountered:
A couple hours after going to high airmass
(maximum reached this night was X=2.0)
there ceased to be nitrogen condensation outflow from 
instrument dewer, indicating it was low to empty.

I noticed outpouring of liquid nitrogen when 
slewing to moderate airmasses X~1.5 and higher.
I realize some runoff should be expected, but should it
run low to empty after going to airmass of 2.0?
Is there trouble, or is a re-fill necessary soon after going
to high airmass?

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Submitted on 2002 Feb 7 [7:29:57]