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- Newsgroups: sci.philosophy.tech,sci.physics,sci.skeptic
- Path: sparky!uunet!munnari.oz.au!yoyo.aarnet.edu.au!news.adelaide.edu.au!augean.eleceng.adelaide.edu.AU!dabbott
- From: dabbott@augean.eleceng.adelaide.edu.AU (Derek Abbott)
- Subject: Re: Measurement & Precision
- Message-ID: <1992Nov10.121329.7384@augean.eleceng.adelaide.edu.AU>
- Organization: Electrical and Electronic Eng., University of Adelaide
- References: <1992Nov2.043143.24298@augean.eleceng.adelaide.edu.AU> <1dck8fINNgie@agate.berkeley.edu>
- Date: Tue, 10 Nov 1992 12:13:29 GMT
- Lines: 55
-
- In article <1dck8fINNgie@agate.berkeley.edu> lizi@soda.berkeley.edu (Cosma Shalizi) writes:
- >In article <1992Nov2.043143.24298@augean.eleceng.adelaide.edu.AU> dabbott@augean.eleceng.adelaide.edu.AU (Derek Abbott) writes:
- >>Imagine you are a stone age philosopher. All you have are your big chunky
- >>stone tools to work with to engineer with for everyday life.
- >>You produce a persuasive argument that it is impossible to ever produce
- >>tools, machines and measurements that are accurate to within micrometers
- >>(or fractions of a camel's hair).
- >>It is obvious to you that your coarse implements can't measure to any greater
- >>accuracy than they are already and so engineering to greater precision
- >>is philosophically impossible, by simple inductive reasoning.
- >>Where is the flaw in his argument?
- > 1. Induction is not valid. This has been known for some time. There are
- > many inductive arguments which are rational - the fact that all observed
- > crows have been black _is_ reason to believe that all crows are black -
- > but not valid, the way, "All men are mortal, and Socrates is a man,
- > therefore Socrates is mortal" is valid.
- > 2. This is not a philosophical argument but an engineering one. "With our
- > current technology, it is impossible to make things finer than a
- > camel's hair, and we can think of no ways of improving things to get
- > around this limitation." This is a very sound argument. With stone age
- > techniques and science, there is no way to make tools or measurements
- > of the desired accuracy.
-
- Exactly. If you are a stone age man with a measuring stick that is marked
- off in certain intervals that are done as "accurately as can be," then it
- is very difficult for you to see how to make them any more accurate
- (as you would have done it in the first place).
-
- The coarseness of your implements appear to be the absolute limit. The vision
- to overcome this limit by use of a leveraging type principle (say) is not
- forthcoming.
-
- It is this limitation in mental vision that is interesting, not so much that
- it was an engineering example.
-
- >>I'm wondering to what extent we are tricking ourselves with words
- >>(like the stone age man example did) today when we grapple with such
- >>philosophical mysteries as quantum mechanics, mind-body problem,
- >>determinism v. free will etc.
-
- There maybe a concept lacking in our vision that that has yet to be found.
-
-
-
- PS. BTW, it would be an interesting to put 5 or 6 scientists/engineers on
- a desert island (rich in ores) with the goal of producing a 5um accuracy stepper
- motor from stratch. They are allowed any text books they like and we feed them
- well, so they can work on it full time.
-
- It would be interesting to see if they could do it within their life time.
-
- Do people think it would necessarily take a number of generations?
-
- Also recording the minimum number of steps it took to "bootstrap" modern
- precision out of stone age tools would be a fascinating bit of trivia.
-