Setting default face-font in Carbon Emacs

[Tim McNamara]

The default face in Carbon Emacs is tiring the read (Courier, I
think).  I'd like to replace it with something easier to read.
Unfortunately Emacs doesn't seem to be able to access the native Mac
fonts, although I am not sure about this.  Trying to get it to use
Lucida Grande, I put

(set-face-font 'default "-apple-lucida
grande-medium-r-normal--12-140-75-75-m-120-mac-roman")

in my .emacs file, but only the default opening buffer is in this
font- all subsequent buffers revert to the Courier font.  Obviously my
configuration is incomplete somehow.  How do I get the face to apply
to all buffers?  I would have throught that

     set-face-font 'default

would do this automatically, but apparently not.

Carbon Emacs 21.3.50.1, not built by me, 5/29/04 (US date convention).

Thanks for any help!