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RE: Precision in engineering calculations

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>From my first statics class textbook, "Vector
Mechanics for Engineers - Statics," by Beer and
Johnston, 3rd Edition:

" data are seldom known with an
accurancy greater than 0.2 use 4 figures
to record results beginning with 1 and 3 figures in
all other cases..."

That made sense to me then.  Now that I am much older,
I think that 0.2 percent should be more like one or
two percent or more...  but I still usually follow
their advice.

d a v e e v a n s

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