Re: How do you draw a straight line?

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Article #4562

#4562

From: John Harper
Date: Mon, 05 Oct 1992 01:42

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In article <1992Oct2.224220.24242@access.usask.ca> choy@skorpio.usask.ca (I am a terminator.) writes:
>How do you know that the line you draw is really straight? 
Machine tool makers faced this at the beginning of the Industrial Revolution
around 200 years ago. The practical test used was: take 3 bars of iron, work 
on all 3 with a hand file until any two fit together either way round with 
no gaps visible anywhere. Now you can think about making your first lathe...

John Harper Mathematics Dept. Victoria University Wellington New Zealand

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From: harper@kauri.vuw.ac.nz (John Harper)
Subject: Re: How do you draw a straight line?
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