evgenit comments on Epistemic security: example from experimental physics - Less Wrong
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I think this summary omits a key point: How we know that the road still takes us from A to B? As far as I can tell, the answer is "by experiment" --- we know from repeated use how the instruments behave, and therefore it doesn't matter what our map of the world was when we initially built them. It could, of course, be that they are off --- but we know (by experiment) their precision, and so we can use that to check precision on other things.
What do you think?
I completely agree. I was trying to make the point that the instruments are theory-free.