Scientific apparatus made from grates under ring (4,4)

I believe the answer is:

bell jars

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'scientific apparatus made' is the definition.
I can't tell whether this definition defines the answer.

'grates under ring' is the wordplay.
'grates' becomes 'jars' (I've seen this before).
'under' is a charade indicator (letters next to each other) (below, in a down clue).
'ring' becomes 'bell' (both can mean to call on the phone).
'jars' put after 'bell' is 'BELL JARS'.

'from' is the link.

Can you help me to learn more?

(Another definition for bell jars that I've seen is " glass containers".)

I've seen this clue in The Independent.

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