> Actually I believe the original definition was in terms of the earth's > circumference, just like the nautical mile. <g> Nope, actually it was defined in 1791 as one ten-millionth of the length of the earth's meridian along a quadrant (one fourth the circumference of the earth). Thus, the meter was intended to equal 10-7 or one ten-millionth of the length of the meridian through Paris from pole to the equator. However, the first prototype was short by 0.2 millimeters because researchers miscalculated the flattening of the earth due to its rotation. Still this length became the standard. Various new definitions were adopted over time, until in 1983 the CGPM replaced the previous definitions by the following definition: ** The meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second. ** Source: http://www.physics.nist.gov/cuu/Units/meter.html Regards Andrew (whose speedometers <note it's not a speedomile> all read in kilometres per hour - except the Air Speed Indicator in the airplane - which reads in knots....) ----- Original Message ----- From: "David Beierl" <dbeierl@ATTGLOBAL.NET> To: <vanagon@GERRY.VANAGON.COM> Sent: Thursday, May 16, 2002 7:18 PM Subject: Re: Warning!!! Check Your Speedometer - What a Sad, Sad Example
> At 04:42 AM 5/16/2002, Andrew Grebneff wrote: > >Matric is the ONLY system which makes any sense. The meter itself may > >be arbitrary in length, but the other measures are all based directly > >on it. > > Actually I believe the original definition was in terms of the earth's > circumference, just like the nautical mile. <g> > > d > > > -- > David Beierl - Providence, RI > http://pws.prserv.net/synergy/Vanagon/ > '84 Westy "Dutiful Passage" > '85 GL "Poor Relation" > |
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