We have already talked about changing font sizes and selecting
spacing, and have pointed out that three families of fonts are
available.
These are fonts which are fourteen points high, twelve points
high and tenpoints high.
The twelvepoint font is the font PHYZZX uses for normal text
because it looks best when reduced.
The fourteenpoint fonts are used for chapter titles, etc., and
the tenpoint font sets, which are kind of small when reduced,
are generally reserved for footnotes.
To change font size at will you type either
tenpoint, or
twelvepoint, or
fourteenpoint.
To change spacing conventions you use the commands
singlespace, or
normalspace
or
doublespace.
Note that all of these commands can be used inside the paper
to temporarily change what is going on;
however, you should only invoke the
commands which change spacing when you are between paragraphs.
If you violate this rule, eventually, you
will be sorry.