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'[TECH]:: Engineers mental toolbox - Calculateodds '
2009\07\18@142732 by Carl Denk

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Land surveyors for ordinary property surveys work to 8 decimal places.
Geodetic surveyors (say across a state or country) work to many more. In
1960 surveying class, a required text was logarithms of the trig
functions (sine, cosine, tangent, and cotangent) to 8 places. Slide rule
couldn't be used, and a few rotary calculators were available. We did
use hand operated rotary calculators ,where one had to manually shift
the carriage to do the carry, or underflow in division. The University
computer was an IBM 650 with many tubes (valves).  If you go to your
state's site for land surveyor registration, you should find the
accuracy that surveyors are bound to in the regulations.

Alan B. Pearce wrote:
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