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

[J. Forster]

It's probably a defined number of feet.

-John

=============


> 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
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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