Hi James, Don and All: If the history of length measure be taken into consideration (3937/3600)m or yard; this would work to the proposed METRE New (m') of 1.11194886884 times the metre, which I have tried to link with 1-degree arc-angle 'whose 1/100th i.e. ONE minute' of arc is what I have tried to call: The Nautical Kilometre; and the clock of *Decimalized HOUR*. 1.093611111 times metre, however, shall not meet the dimensions of Earth radius (hypothetically)round, since dimensions vary between polar and equatorial earth. Brij Bhushan Vij <[EMAIL PROTECTED]>
>From: James Frysinger <[EMAIL PROTECTED]> >Reply-To: [EMAIL PROTECTED] >To: "U.S. Metric Association" <[EMAIL PROTECTED]> >Subject: [USMA:21465] Fwd: Re: Inch >Date: Wed, 31 Jul 2002 21:14:26 -0400 > >Sorry! I had my conversion factors inverted in the message below. Thanks to >Joe Reid for catching my blunder! > >Jim > >---------- Forwarded Message ---------- > >Subject: [USMA:21455] Re: Inch >Date: Wed, 31 Jul 2002 12:24:49 -0400 >From: "James R. Frysinger" <[EMAIL PROTECTED]> >To: "U.S. Metric Association" <[EMAIL PROTECTED]> > >Markus Kuhn wrote: > > Jim McCracken wrote on 2002-07-31 13:45 UTC: > > > The inch was not set at 25.4 millimeters centuries ago, but in the > > > 1950s. > > > > Was setting the inch to 25.6 mm or 25.0 mm seriously discussed as an > > option at this or at any earlier opportunity? Is the rationale for the > > choice of 25.4 mm for the inch documented somewhere in more details, as > > well as the history of previous definitions for the inch? > > > > When was the inch defined in the US for the first time with an accuracy > > of better then 0.1 mm? the practice of length measurement with a > > relative error below 1% surely must predate the 1950s significantly ... > > even centuries ... > > My understanding is that the definition of the yard (from which the >definitions of the foot and the inch are derived) was chosen to fall >between the U.S. yard and the U.K. yard in size. In otherwords, it is a >compromise value. > > In the U.S., the yard was defined in 1893 as being exactly (3937/3600) >m and in 1959 it was redefined to be exactly 0.9144 m. Surveyors >objected, so they were allowed to retain the old mile and foot >definitions---e.g., (3937/1200) m for the foot---and that is the basis >for the U.S. survey foot and survey (or statute) mile. Those differ from >the new definitions by about 2 mm/km. > > Citations are available at my web page > http://www.cofc.edu/~frysingj/background.htm > >Jim > >-- >James R. Frysinger >Lifetime Certified Advanced Metrication Specialist >Senior Member, IEEE > >http://www.cofc.edu/~frysingj >[EMAIL PROTECTED] >[EMAIL PROTECTED] > >Office: > Physics Lab Manager, Lecturer > Dept. of Physics and Astronomy > University/College of Charleston > 66 George Street > Charleston, SC 29424 > 843.953.7644 (phone) > 843.953.4824 (FAX) > >Home: > 10 Captiva Row > Charleston, SC 29407 > 843.225.0805 > >------------------------------------------------------- > _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com
