%%
%% The LaTeX Companion, 3ed
%%
%% Example 10-1-2 on page II-10 in "Direct use of the fonts (without a package)".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}

%StartShownPreambleCommands
\renewcommand\sfdefault{FiraSans-LF}
%StopShownPreambleCommands

\begin{document}
\centering
\fontsize{42pt}{42pt}%              Select a size
\usefont{T1}{Alegreya-OsF}{ub}{n}%  Select a font
Alegreya-Ultra~42                %      Go

\tiny\fontseries{el}\sffamily    %    Change
A tiny light Fira Sans 42
\end{document}