%
\expandafter\xdef\csname c@tcode\endcsname{\the\catcode`\@}
\catcode`\@=11
%
\def\center{%
\noindent\leftskip=0pt plus 1fil\relax\rightskip=0pt plus 1fil\relax
\parfillskip=0pt\parindent=0pt\relax}
%
\def\picture#1{% Leave space for a picture later.
\nobreak\null\vskip #1\relax}
%
\def\monthname{\ifcase\the\month
nil\or January\or February\or March\or April\or May\or June\or
July\or August\or September\or October\or November\or December\fi}
\def\sp@ce{ }
\edef\today{\the\day\sp@ce\monthname\sp@ce\the\year}
{\count200=\time \divide\count200 by 60 \edef\hour{\number\count200}
\multiply\count200 by 60 \advance\count200 by -\time 
\xdef\now{\hour:\number-\count200}}
%
\def\deg{\ifmmode^{\circ}\else$\deg$\fi}
%
\def\makeslashover{\mathcode`/="8000
\everydisplay{\let/\over}}
%
\newcount\eqcount
\def\addeqno#1$${#1\eqno\global\advance\eqcount by 1 (\number\eqcount)$$}
\def\numberallequations{\expandafter\everydisplay%
\expandafter{\the\everydisplay\addeqno}}
%
\def\LaTeX{{\rm L\kern-.36em\raise.3ex\hbox{\sc a}\kern-.15em
T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}}
%
\catcode`\@=\c@tcode