Icicles

These had formed inside my liquid nitrogen dewar. I haven't been getting quite the right results from this instrument this week...it's a reasonably high maintenance bit of kit and one of the frustrations about my job is not having the time I'd like to be able to devote to it. I have managed to get the library to find a copy of the 'bible' of this technique though, which took about a year but it's really useful.