Re: [time-nuts] Standards for units

At 9:57 PM -0700 4/2/07, Tom Van Baak wrote: >> >1/meter/39.37 inches = 0.025400051 meters/inch ... > >> The interesting thing is that this result is off by 2.04000 ppm. >> That's a rather precise error! >> >> The calculator I used is here: >> http://homepage.ntlworld.com/r.howitt/Calcula

Re: [time-nuts] Standards for units

> "David" == David Dameron <[EMAIL PROTECTED]> writes: David> (I was taught that 1 meter was 39.37 inches, to define the David> inch, but now I see more of 1 inch = 2.54 cm, as someone just David> referred to.) That was the old inch. It was changed back around 1954 or so. They decided they

Re: [time-nuts] Standards for units

> >1/meter/39.37 inches = 0.025400051 meters/inch ... > The interesting thing is that this result is off by 2.04000 ppm. > That's a rather precise error! > > The calculator I used is here: > http://homepage.ntlworld.com/r.howitt/Calculator.htm David, There are two ways to compute relativ

Re: [time-nuts] Standards for units

> >As long as exact means within a few parts per million: > >1/meter/39.37 inches = 0.025400051 meters/inch ... > The interesting thing is that this result is off by 2.04000 ppm. That's a rather precise error! The calculator I used is here: http://homepage.ntlworld.com/r.howitt/Calculator.

Re: [time-nuts] Standards for units

> My recollection when I posted the earlier letter was 24.5 mm/inch was > exact by definition, and I recalled that 39.37 inches/meter was also > exact... a quick calculator check to 6 figures showed that it was > exact, then I tried to 9 figures, and saw that pesky little > 0.00051. I did th

Re: [time-nuts] Standards for units

>>> 1 meter/39.37 inches = 0.02540 meters/inch = 2.54 cm/inch = 25.4 mm/inch >>> >>> Exactly. >>> >> As long as exact means within a few parts per million: >> >> 1/meter/39.37 inches = 0.025400051 meters/inch ... >> >> >>> -Chuck Harris >>> >> _

Re: [time-nuts] Standards for units

Chuck Harris wrote: > Chuck Harris wrote: > >> David Dameron wrote: >> >>> Hi all, >>> I just realized that a meter is defined by the speed of light., see >>> http://physics.nist.gov/cuu/Units/meter.html >>> It is only to 9 significant digits, so if the speed of light (in some >>> controll

Re: [time-nuts] Lucent RFTG-m-XO ...

geo wrote: > Hi Jason, > > perhaps i am the only "german", currently available. My english is not good > but i hope, it's less pain for you to read my "english" than to read the > german text ;-) > > Best regards > > Martin Bertges > > > > Description of Lucent RFTG-m-XO GPS frequency standard > ve

Re: [time-nuts] Lucent RFTG-m-XO ...

Hi Jason, perhaps i am the only "german", currently available. My english is not good but i hope, it's less pain for you to read my "english" than to read the german text ;-) Best regards Martin Bertges Description of Lucent RFTG-m-XO GPS frequency standard ver. 20.03.2007 Introduction The L

Re: [time-nuts] Standards for units

Chuck Harris <[EMAIL PROTECTED]> wrote: > > 1 meter/39.37 inches = 0.02540 meters/inch = 2.54 cm/inch = 25.4 mm/inch > > > > Exactly. > > As long as exact means within a few parts per million: > > 1/meter/39.37 inches = 0.025400051 meters/inch ... Nobody needs that kind of precision whe

Re: [time-nuts] Lucent RFTG-m-XO GPS Disciplined Frequency Standard

Good find! Can anyone read German and translate the rest of the text? Jason >At the following link: > > > >( Item number: 110108963303 ) > >you c

Re: [time-nuts] Standards for units

Chuck Harris wrote: > David Dameron wrote: >> Hi all, >> I just realized that a meter is defined by the speed of light., see >> http://physics.nist.gov/cuu/Units/meter.html >> It is only to 9 significant digits, so if the speed of light (in some >> controlled environment) is measured more precisel

Re: [time-nuts] Standards for units

David Dameron wrote: > Hi all, > I just realized that a meter is defined by the speed of light., see > http://physics.nist.gov/cuu/Units/meter.html > It is only to 9 significant digits, so if the speed of light (in some > controlled environment) is measured more precisely than this, the meter and

Re: [time-nuts] Standards for units

It is interesting to look in the front of the International Critical Tables, an encyclopedic set of books containing detailed scientific information about 1920. Every nation, (hundreds of them) had their own units which were used in commerce and trade. Unfortunately the only access on the n

Re: [time-nuts] Standards for units

From: "David Dameron" <[EMAIL PROTECTED]> Subject: [time-nuts] Standards for units Date: Sun, 1 Apr 2007 20:45:49 -0700 Message-ID: <[EMAIL PROTECTED]> > Hi all, > I just realized that a meter is defined by the speed of light., see > http://physics.nist.gov/cuu/Units/meter.html > It is only to 9