Mar 18, 2009: Even rounder thing

[xoxoxoBruce]

Cool, thanks Coign.

I'm confused, the first link says;

The best sphere the ACPO team has ever made had a total out-of-roundness of 35 nanometres. That is, the diameter varies by an average of only 35 millionths of a millimetre, making it probably the roundest object in the world.

And the second link says;

The roundness delta of the finished sphere (being held above) is about 50 nm on a 93.6 mm diameter. It is believed to be the roundest object in the world.

These technical writers seem be pretty cavalier about claiming, "roundest object in the world'.

Yesterdays balls were round within 40 atomic layers, and I have no idea how to compare nanometers to atomic layers. I suppose it would make a difference what material it was 40 atomic layers of.
Anyway, my balls ain't round.