[Boatanchors] Boatanchors Digest, Vol 82, Issue 27
James Liles
james.liles at comcast.net
Tue Nov 16 17:59:22 EST 2010
The original definition of the Meter was a fraction of the distance from a
bronze plate in Paris, which is still there, to the North pole; then came
the platinum iridium bar; then the re-definition in 1983. Kindest regards
Jim K9AXN
> Message: 1
> Date: Tue, 16 Nov 2010 09:39:25 -0800
> From: mac <w7qho at aol.com>
> Subject: Re: [Boatanchors] SI units and the rest
> To: Boat Anchors List <boatanchors at mailman.qth.net>
> Message-ID: <7C852EF6-06CB-45A7-AD1D-07908E849439 at aol.com>
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> 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
>
> *************
>
> On Nov 16, 2010, at 7:20 AM, rbethman wrote:
>
>> We are held hostage to the antiquated "platinum" bar held in France to
>> determine "what" a kilogram is, and "derive" the unit called the
>> "gram"
>> from this *item*.
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