Jerry, The "International System of Units (SI)" was first *defined* by the CGPM in 1960. SI is based on the meter, kilogram, second, and ampere (MKSA) and several other "base units"; not on the centimeter, gram, second (cgs) plus either esu or emu electrical units. Thus SI is more recent and more coherent than the cgs system of units after adoption of the ampere as the base electrical unit rather than the esu or emu.
No national (e.g. NIST) or international (e.g. CGPM or ISO)standards body has ever *defined* 25 mm or 300 mm as a base or derived metric *unit*. The probability is close to zero that either 25 mm or 300 mm shall ever be so designated. I never said that the millimeter did not exist before 1960. Please read more carefully,and study BIPM and NIST documents on SI which can be downloaded over the Internet. Gene. ---- Original message ---- >Date: Sat, 24 Jan 2009 22:01:33 -0800 (PST) >From: Jeremiah MacGregor <[email protected]> >Subject: Re: [USMA:42452] Re: A thin veneer of dishonesty >To: [email protected], "U.S. Metric Association" <[email protected]> > > Gene, > > I understand an English inch is defined as 25.4 mm > and an English foot is defined as 304.8 mm, etc., > but the original comment was the definition of a > metric inch and a metric foot, etc. In my opinion, > a metric inch would be 25 mm and a metric foot 300 > mm, . > > Are you saying that metric units were only defined > in 1960? I thought metric has been around since > about 1790. I know the millimeter existed before > 1960. Why do you say otherwise? > > Jerry > > ------------------------------------------------ > > From: "[email protected]" <[email protected]> > To: [email protected]; U.S. Metric > Association <[email protected]> > Sent: Saturday, January 24, 2009 3:32:11 PM > Subject: Re: [USMA:42452] Re: A thin veneer of > dishonesty > Jerry, > > Crazy numbers? How old are you, Jerry? Many things > were first invented and manufactured before any of > us were born, before metric units were invented, and > certainly, before the SI was first defined in 1960. > How could these things have been created in > round-number millimeter sizes before the millimeter > was invented? > > Gene. > > ---- Original message ---- > >Date: Sat, 24 Jan 2009 10:17:04 -0800 (PST) > >From: Jeremiah MacGregor > <[email protected]> > >Subject: [USMA:42452] Re: A thin veneer of > dishonesty > >To: "U.S. Metric Association" <[email protected]> > >Cc: "U.S. Metric Association" <[email protected]> > > > > Brian, > > > > Wouldn't a metric inch be 25 mm, a metric foot be > > 300 mm, and a metric mile 1600 m? > > > > Isn't a metric pound already used as 500 g in > some > > countries? So why do we have to have these crazy > > numbers? > > > > Jerry
