Many more than Varley's bellies!
But without some formula for dealing with difficulty of allowing for the wasted space when stacking rounds (pretty much in all three cases!) you will have to do it like Archimedes.
__________________
David V
Lord Finchley tried to mend the electric light
Himself. It struck him dead and serve him right
It is the duty of the wealthy man
To give employment to the artisan
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