cryogenic tempering

As i work in a physics dept. at Cornell, I work with niquid nitrogen alot and it will burn you if get some on your hands and you expecially dont want to get it in your eyes..so wear your gloves and goggles when working with this stuff...and if you get worts you can use it on those too! A professor here, when we broke ground for our microkelvin lab (for trying to reach absolute zero) actully gargled with it....only for trained professionals.

stan

Okaaaaaaaayyyyyyyyyy!

We'd better delete that "gargling" part!

I know one maker who'd take that as a challenge!

well, the professor in question works in low temp research and is a nobel prize winner.....definitly not for the everyday person to perform and highly unrecommended!

Thanks, Stan.

Safety is the word. Although common sense will dictate to a great degree how we handle this cold stuff.

I/we really apprecaite your input.

First, thanks for all the great information. Now, a question. I just spoke with the local liquid nitrogen supplier about dewars. He asked what I was using it for and suggested using an insulated thermos, like Stanley makes. He claims that other have used this method and that they will fill them there. It does seem very inexpensive. Has anyone tried this? I realize that is is inert, but am I potentially asking for trouble. For example, what if I dropped the thermos?

TIA,
Brett

The main problem with the thermos is the mouth opening size is fairly small.
Big blades won't go down inside.
I have a new DEWER I got from Jerry Hossom last year, and neither he nor I have ever used it.
They run a couple hundred bucks new,I will sell or trade for.
I traded some mammoth ivory handle materials for it.
Anyone interested, E mail me directly please.This is not a for sale forum, OK?
geneosborn@centercross.com

If you just want to do one blade at a time, and waste your time driving back and forth for each liter of LN2, fine. You won't be able to screw on the cap tightly, unless you want the thing to explode, and, the first time you fumble a blade, it's gonna break the thermos, assuming you use a glass one.

You need enough LN2 to keep the entire blade immersed, and, as Geno pointed out, an opening big enough for it to fit into.

There are some things that just shouldn't be done half-a**ed. This sure seems like one of them to me.


RJ Martin

Wow! I haven't been on the forum for a few days. Lots of good info. Thank you everyone!

That dewer is sold.
Thanks for all the responses.