"What is the name and use of this scientific glass item? PYREX USA 4 neck spherical glassware."
A: "This is a glass receiver jar used in old dairy vacuum systems. It allows milk to separate out of the airsteam. Afaik modern systems use stainless steel versions and they are no longer in production."
If I remember correctly that's a book holder, two straps are used to hold the books and that's the handle.
Used on a siphon hose to keep air from entering the vine wile not used, thus preventing vineger growth.
My Dad had some, he'd get them out when we went ice fishing!
Don't Google it, Duckle it!