Sciencemadness Discussion Board

Whats this?

dann2 - 13-8-2008 at 05:26

Hi,

I purchased the following item for a few cents in a second hand shop. Wondering what it is?
My guess is that it is a device for getting a small sample of what is coming over out of a boiling flask. Then again if you put this on a boiling flask it would pop off.

Dann2

glass.jpg - 6kB

ScienceSquirrel - 13-8-2008 at 06:13

That is an addition gizmo for working under anearobic conditions.
The solid is placed in the end and then attached to the three necked flask. The flask is filled with nitrogen and then the gizmo is turned so the solid falls into the reaction mixture in the flask.

vulture - 13-8-2008 at 09:30

Are you sure about that, it doesn't explain the hole.

It could be a venting valve for a rotary evaporator.

ScienceSquirrel - 13-8-2008 at 09:37

Quote:
Originally posted by vulture
Are you sure about that, it doesn't explain the hole.

It could be a venting valve for a rotary evaporator.


It could be.

I just made a wild guess. I have never seen or used anything quite like it.

[Edited on 13-8-2008 by ScienceSquirrel]

The_Davster - 13-8-2008 at 10:01

I can't explain the hole, but I have seen other male GG joints randomly have this hole. There seems to be no purpose to this hole where I have seen it before, ex on a couple condensors.

bfesser - 13-8-2008 at 10:06

Looks like the stopper to a Thunberg tube.

Example:
http://kimble-kontes.com/html/pg-899250.html

The_Davster - 13-8-2008 at 10:44

Looks like I was wrong about no purpose in this case! I stand corrected!

Why those holes have been on condensers only makes sense if they reused old joints.

Klute - 13-8-2008 at 13:53

Perhaps it's part of an small sublimator? And the hole realy looks likes a venting hole as used in a Rotavap. Maybe it's to vent the sublimator?

EDIT: after looking at that link, indeed the hhole seems to be there to open vacuum or/and inert gas opening.

[Edited on 13-8-2008 by Klute]