@migurski https://en.wikipedia.org/wiki/Surface_plate#History

@vruba are these the ones made with the three-plate system?

@migurski These are they.

@hans @vruba Have either of you read “Exactly” by Simon Winchester? It's pretty good, but could stand to be perhaps 10 % more hardcore nerd-y.

@urschrei @hans Ooh, will have to pick it up.

@urschrei @vruba I've never seen this before and this proves the attention-optimization algorithms are useless.