Guestion about Pots

[Neuromancer]

All of the pots I see are (basically) cylinders open on one end.

I was thinking, why don't they make "caps" for the top?

Something like a funnel, that makes the opening at the top a bit smaller.

I realize that too small would impede on the heat escaping, there must be a point where the heat escape is not hindered and the coolant loss still would be lowered. ( I also assume that is why people insulate their pots too...well that and to avoid getting hurt between freezing or heating it up to remove it???)


LOL

At what point does heat exhaust exceed coolant loss, and do you guys have little "lids you place over your pots between runs?" or... is your cooling medium so free flowing is does not matter?

Or am I over thinking this?

(Sorry trying to prepare for making the plunge to real clocks :))


Edit: If not a single funnel up.. why not one up and and one down, to allow exchange...


EDIT: Ohh or if evaporation was not enough... you could actually stimulate with a smaller intake and a fan to make the dual tipped single exhaust super flow... (perijet design.. lol not taking credit for that)

[Josifek]

Well you can use the top of the bottle... The hole i quite small and the bottle freezes to the pot in a few minuites that seales "connection" Also you can put a piece of insulation right on top of the pot...

[DrNip]

I always use a old sock and cover the top of mine.

[Buckeye]

I don't use anything on the top of my F1. It's not hard to pour into it.

[Neuromancer]

I don't use anything on the top of my F1. It's not hard to pour into it.

The funnel I was thinking of, mounting it upside down.

I figured they do not make pots with a narrow mouth preceisely because you are dumping stuff in it, the funnel/cover was about evaporative loss of the LN2 etc...

I see some of you guys do cover it, so guess I was not off base entirely. :)