Message-Id: <6.2.1.2.2.20050519041113.0468f380@mail.jefsey.com>
Date: Thu, 19 May 2005 04:48:37 +0200
To: verdy_p@wanadoo.fr, Eric Muller <emuller@adobe.com>,
	unicode@unicode.org
From: "JFC (Jefsey) Morfin" <jefsey@jefsey.com>
Subject: Re: ASCII and Unicode lifespan
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At 17:13 18/05/2005, Philippe VERDY wrote:
> > The motivation for the sqrt(2) ratio: if you fold a piece of A paper in 
> two, you get exactly an A piece. Thus you can print two A4 pieces side by 
> side on an A3 piece, without margins. If you scale up an A4 piece, you 
> can fit precisely an A3 piece, without margins (and conversely). Combine 
> the two, and you can print two A4 pieces side by side, scaled down, on 
> one A4 piece, without margins. Very convenient.
> >
> > The motivation for one of the A = 1 square meter: the metric system.
> >
> > The motivation for the actual dimensions: given the constraints above, 
> 297 x 210 is close to 270 x 210, the previously used common size (at 
> least in France). I don't know where that older standard comes from.
>
>I've never seen and used 21x27cm paper. If it has existed, it may be 
>because of bad spelling when commanding paper reams of 21x29,7cm.
>Or because 21x27cm resulted from detachable bands of roughly 1.5cm with 
>glue on a standard A4 paper, or to avoid cutting the folded paper sheet 
>inserted in a DL envelop.

21x27 became progressively obsolete after 21x29.7 it became the Government 
document size 1970 as part of European unification, taking the German 
system, as compatible with the Metric System. As documented. This made to 
change the furniture :-)

BTW paper is defined by the wheight of an A0 page. "80" is the common 
quality used. Three A4 pages in an envelope can be sent with the standard 
post stamp.

A point which may help some to better feel what canonical, implied, 
assumed, reference, etc. may mean when refering to relations between 
Unicode, ISO 10646, ISO 639, ISO15924 etc. : "1893: These [received] metric 
prototypes were declared "fundamental standards of length and mass" in the 
<http://lamar.colostate.edu/~hillger/laws/mendenhall.html>Mendenhall Order. 
Since that date [in the USA], the yard, pound, etc. have been officially 
defined in terms of the metric system." I am not sure many know that.  The 
assumed canonical yard actually has the metter as a reference, for 112 years.
jfc


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At 17:13 18/05/2005, Philippe VERDY wrote:<br>
<blockquote type=cite class=cite cite="">&gt; The motivation for the
sqrt(2) ratio: if you fold a piece of A paper in two, you get exactly an
A piece. Thus you can print two A4 pieces side by side on an A3 piece,
without margins. If you scale up an A4 piece, you can fit precisely an A3
piece, without margins (and conversely). Combine the two, and you can
print two A4 pieces side by side, scaled down, on one A4 piece, without
margins. Very convenient.<br>
&gt; <br>
&gt; The motivation for one of the A = 1 square meter: the metric
system.<br>
&gt; <br>
&gt; The motivation for the actual dimensions: given the constraints
above, 297 x 210 is close to 270 x 210, the previously used common size
(at least in France). I don't know where that older standard comes
from.<br><br>
I've never seen and used 21x27cm paper. If it has existed, it may be
because of bad spelling when commanding paper reams of 21x29,7cm.<br>
Or because 21x27cm resulted from detachable bands of roughly 1.5cm with
glue on a standard A4 paper, or to avoid cutting the folded paper sheet
inserted in a DL envelop.</blockquote><br>
21x27 became progressively obsolete after 21x29.7 it became the
Government document size 1970 as part of European unification, taking the
German system, as compatible with the Metric System. As documented. This
made to change the furniture :-) <br><br>
BTW paper is defined by the wheight of an A0 page. &quot;80&quot; is the
common quality used. Three A4 pages in an envelope can be sent with the
standard post stamp.<br><br>
A point which may help some to better feel what canonical, implied,
assumed, reference, etc. may mean when refering to relations between
Unicode, ISO 10646, ISO 639, ISO15924 etc. : &quot;<b>1893</b>: These
[received] metric prototypes were declared &quot;fundamental standards of
length and mass&quot; in the
<a href="http://lamar.colostate.edu/~hillger/laws/mendenhall.html"><i>
Mendenhall Order</a></i>. Since that date [in the USA], the yard, pound,
etc. have been officially defined in terms of the metric system.&quot; I
am not sure many know that.&nbsp; The assumed canonical yard actually has
the metter as a reference, for 112 years.<br>
jfc<br><br>
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