Problem(s) Encountered:

Cryo was filled about 30min before the problem occurred.  When pointing near the zenith, it seemed to have no problem.  While slewing toward lower altitude, substantial amount of liquid nitrogen leaked out of cryo as a continuous stream.  Similar problem happened yesterday, after an hour filling up the cryo.

Solutions:

The leakage of liquid nitrogen, while alarming, is normal.  The dewars will last nearly 24 hour if filled properly, and I''ve never had one run out during the night because of loss of LN2. (John Thorstensen)