Help identify mystery object

definitely looks like something to pull a small vaccum (on the underside). Really need another pic from the bottom to be sure.

Are there fittings underneath?

If not, it looks like you could place it on a flat surface (like the granite) suck the air out of it and close the valve.

If there are threads/fittings underneath...it might be a cap to a larger piece that would basically do the same (hold contents under pressure/vaccum).
 
What Dan said exactly. That's a standard NPT fitting on it if I'm not mistaken. I'll bet that thing really sucks. :D

Norm
 
The fitting looks like a low pressure gas fitting for tubing like the bunsen burners used when I was in high school.
 
Svashtar said:
I'll bet that thing really sucks. :D

Norm
Click to expand...

:D

The bottom was smooth and painted green on the inside of the dome, for some reason.

TL, anything else on the marking?

Wish I had a geiger counter. The workers would, ahem, lick the little paintbrush to keep a point on it- and dip in back into that glow in the dark paint as the painted little dots at 1, 2, 3... oclock.

Could it be a Magdesburg Sphere?


Mike
 
If it is for holding vacuum, I would expect the rim to be pretty smooth on the underside, or perhaps have a groove for a gasket. Probably not mirror polish, but smoother than the visible surface.

This could also be a cap for a pressure vessel. You could have some sort of flange that sits on top of the rim and screws down to a lower part. If it is actually related to the watch business, I'd be that's what it is. Such a vessel could be used to test watches under high pressure.

(Although google tells me that watches are tested under vacuum:
http://www.timezone.com/library/archives/archives631703133992922740
I'm not sure if either of these methods would work if you can't see through the container.)
 
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