% set up LaTeX parameters for British A4 paper.

% modified to allow twoside documents by J.Dalton.

\makeatletter

\newdimen\mainfontsize	\mainfontsize=1\@ptsize pt

% Side margins, text width, etc. -- [jwd]
%
% was: \setlength{\oddsidemargin}{.25 true in}	% left margin 1.25 inch
%      \setlength{\textwidth}{14.85 true cm}	% 21.2 cm - 2.5*(2.54 cm)
%
% Our A4 is 21 cm wide, and the lw setup is off so that the "logical inch"
% added to the sidemargins is actually 0.7 in, or 1.778cm.  Then,
%
%	oddsidemargin = realinsidemargin - logicalinch
%	evensidemargin = realoutsidemargin - logicalinch
%
%	realinsidemargin = <whatever we want>
%	realoutsidemargin = pagewidth - textwidth - realinsidemargin
%
% For backwards compatibility, we want:
%
%	textwidth = 14.85 cm
%	realinsidemargin = 1.25 in.
%
% BUT that's based on the bogus page width, so
%
%	textwidth = 14 cm (always -- but it gives 14.1!)
%	realinsidemargin = 3.5cm (centered for single-sided)
% or	realinsidemargin = 3cm   (4 on other for double-sided)
%
% So, calculating as if textwidth = 14.1cm ...

\setlength{\textwidth}{14.0 true cm}

\if@twoside
   \oddsidemargin 1.222 truecm
   \evensidemargin 1.122 truecm   % was 2.122 -- the new one is just a guess
\else
%   \oddsidemargin 1.672 truecm    % note even = odd
%   \evensidemargin 1.672 truecm
   \oddsidemargin 1.172 truecm    % note even = odd
   \evensidemargin 1.172 truecm
\fi

\topskip=\mainfontsize	% plain has 10pt, so this is the equivalent
\maxdepth=.4\mainfontsize	% plain has 4pt
   \@maxdepth=\maxdepth		% this has to be set as well (cf. latex.tex)

\setlength{\headheight}{\mainfontsize}
\dimen0=2\mainfontsize
\setlength{\headsep}{\dimen0}	% headline gets depth shaved off
\setlength{\topmargin}{\dimen0}
\setlength{\footheight}{\mainfontsize}
\dimen0=2.5\mainfontsize
\setlength{\footskip}{\dimen0}

\setlength{\textheight}{21.34 true cm}	% 30cm - 2in - (8.5\mainfontsize pt)

\makeatother