[net.micro.mac] question about LaserWriter fonts

mmodel@mirror.UUCP (10/17/85)

Having finally got a chance to use a laserwriter, I discovered
that with the Font Substitution option on, Geneva fonts get
replaced by larger Helvetica fonts but that the same size
replacements are used for Monaco and New York.  For instance, 
a word in Geneva 12 seems to come out in Helvetica 14, not 12.

What is happening here?  Can it be stopped short of manually
changing all occurrences of Helvetica in documents?

I find this all particularly weird because the Helvetica
fonts look larger in a given size than Courier or Times Roman.