[Boatanchors] Fw: Re: SI units and the rest

[WA5CAB at cs.com]

I'm curious.  Is there also a Standard Cable?  As in "A cable's length from 
shore"?

In a message dated 11/16/2010 7:12:00 PM Central Standard Time, 
dartaviation at btopenworld.com writes: 
> --- On Wed, 17/11/10, CLIVE COLLINS <dartaviation at btopenworld.com> wrote:
> 
> >From: CLIVE COLLINS <dartaviation at btopenworld.com>
> >Subject: Re: [Boatanchors] SI units and the rest
> >
> >Date: Wednesday, 17 November, 2010, 1:01
> >Greetings from the home of the
> >Imperial system, God bless it!
> >The original metre (note the spelling)was said to be one
> >ten millionth of the distance between the North Pole and the
> >equator. However the longitude was not given a reference for
> >the measurement by the French and didnt take into account
> >geographical terrain variations so today we settle for an
> >electronic version. By the way, for those who might be
> >interested and visiting London, the Britsh Standard foot and
> >yard are made of bronze and are located in Trafalgar square
> >on the South Africa House side of the plaza.
> >Those are the public versions including the standard
> >"chain" (twenty two yards) that is laid out on the ground.
> >The reference measures are kept at the British Standards
> >Institution in very closely controlled conditions.
> >Regards
> >Clive GW3WEQ North Wales Coast UK
> >
> >--- On Wed, 17/11/10, mikea <mikea at mikea.ath.cx>
> >wrote:
> >
> >>From: mikea <mikea at mikea.ath.cx>
> >>Subject: Re: [Boatanchors] SI units and the rest
> >>To: boatanchors at mailman.qth.net
> >>Date: Wednesday, 17 November, 2010, 0:33
> >>On Tue, Nov 16, 2010 at 07:21:30PM
> >>-0500, WA5CAB at cs.com
> >>wrote:
> >>>I'm curious as to why it isn't 1/(3*10^8).  
> >>>
> >>>In a message dated 11/16/2010 11:39:45 AM
> >Central
> >>Standard Time, 
> >>>w7qho at aol.com
> >>writes: 
> >>>>The original definition of a METER  was
> >>based on a measured standard  
> >>>>bar.  The standard was redefined in 1983
> >as
> >>the distance traveled by  
> >>>>light in a vacuum during a time interval of
> >>1/299,792,458 of a  
> >>>>second,   The standard kilogram is
> >>a a cylindrically shaped platinum- 
> >>>>iridium slug and is the only SI unit still
> >>defined by an artifact  
> >>>>rather than a fundamental physical property
> >that
> >>can be reproduced in  
> >>>>different laboratories.
> >>>>
> >>>>Dennis D. W7QHO
> >>>>Glendale, CA
> >>
> >>The second was deemed to be a more fundamental unit,
> >since
> >>it could be
> >>defined directly from a quantum transition, and so
> >the
> >>meter became a
> >>derivative unit defined in terms of the second. 
> >>
> >>-- 
> >>Mike Andrews, W5EGO
> >>mikea at mikea.ath.cx
> >>Tired old sysadmin 
> 

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