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Subject: Re: what is 100R mean in a schematics?
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Date: Wed, 25 Dec 2002 08:05:50 GMT
NNTP-Posting-Date: Wed, 25 Dec 2002 09:05:50 MET
Organization: Telenet Internet
If you can't agree on the exact ratios, this must be the best plea for SI.
if 1 mile = 1760 yards
and 1 yard = 3 feet
and 1 foot = 12 inches
and 1 inch = 25.4 mm
then 1 mile = 1609.344 meter.
the 25.4 mm/inch is exact, so the 1609.344 is exact if you multiply 63360 by
dividing 63360 by 39.37 (rounded!) gives a rounding error.
Is there a unit defined as 10 yards, 11 yards, 16 yards or 20 yards? (a few
dividers of 1760)
"Tom MacIntyre" wrote in message
> On Tue, 24 Dec 2002 19:31:07 +0000, John Woodgate
> >I read in sci.electronics.design that Alex Gibson
> >wrote (in ) about 'what is 100R mean in a
> >schematics?', on Wed, 25 Dec 2002:
> >>Things like torque conversions are the real PITA
> >>going from foot or inch pounds to newton metres.
> >You just have to make the effort to commit the conversion factor to
> >memory. With non-metric units, that's nothing unusual:
> >An Imperial pint of water weighs a pound and a quarter.
> 20 ounces...beer is about the same also. We (Canada) have official 16
> ounce pints in the US system, and beer pints that are 12 ounces.
> >A cubic foot of water weighs 62.5 lb.
> I remember 62.4, but who cares? :-)
> >Five and a half yards is one rod, pole or perch.
> Never became familiar with those ones...fathom, chain, neither of
> those as well.
> >An acre is 4840 square yards; 220 yards by 22 yards.
> Here it's 208 feet by 208 feet...I think.
> >A mile is 63350 inches.
> 5280 feet, 1760 yards...something less than 1760 metres...I guess
> it'll be 63350/39.37 metres? :-)