OOTP Dumbledore's silver instruments & 'in essence divided.'

[Cindy]

No: HPFGUIDX 63537

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Hello All,
I have just been reading ootp for the second time, and there is
something that I am definately not clear on. After Harry has the dream
that is not really a dream where he sees Nagini attack Arthur Weasley,
and he is standing in Dumbledore's office - what is Dumbledore doing,
and what is he talking about, when he uses that silver instrument...
This is on pages 415-416 (not the US edition, the UK one)...so here
are my questions:
1) What do you think the silver instrument is used for?
2)What does Dumbledore mean by "naturally, naturally" - I think that
it might have something to do with the fact that Voldemort was using
Nagini to scope out the situation at the MoM...What does everyone else
think?
3)What did Dumbledore mean when he said "but in essence divided" - and
why did the snake head split into two heads when he said this?
I think it might possibly have something to do with Voldemort and
Nagini. Perhaps Voldemort and Nagini are almost one 'thing' but they
are in 'essence divided', perhaps Dumbledore has found a new weekness
concerning Voldemort (because Voldemort looks like a snake, so he must
have used something from a snake during his 'dark' transformations) -
and I think that whatever he used might have been from Nagini...
But then again, what if he was refering to Harry and Voldemort - what
would the two snake heads mean then, considering that the Sorting Hat
wanted to place Harry into Slytherin.
What does everone else think?
-Cindy