I've seen that mark in various writings in many languages both old and new.

Bob Jewett said:

Well, 2.25 inches is 57.15mm exactly. 57.2mm is 2 thousandths of an inch large which is still with spec. But you're right, both units should be given with sufficient accuracy.

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It's still wrong. If you re-made your EDM go/no-go gauge today based off the 57.20mm as the nominal, rather than 57.15mm exact, the gauge would be worthless.

btw, I found the Wikipedia article. It was worse than I remembered. The metric and inch units with tolerances result in two completely different ball sizes. Something like this can easily creep into a spec, if the person doing it is not very careful (or knowledgeable on the subject), as this wikipedia illustrates.


Link: https://en.wikipedia.org/wiki/Pool_(cue_sports)

Price drop bump will drop price to 350. Plus shipping

It's a pool room in the Philippines and a table brand.

Fore Rail said:

I would agree that your example has a very low probability of happening.

I am thinking there will be many arguing that the solids were never legally chosen & therefore the 8 ball cannot be shot to win the game. In that situation just about everyone would say the incoming player has to shoot the stripes because of the above.

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There was a case in the appendix for the 2010± BCA rules that states (IIRC) "If an entire group has been eliminated from the table without the groups having been determined, then all players are allowed to shoot at the 8-ball."

So, for WPA this is conforming with an old BCA rule.