make-frame with custom font size

[Sam Halliday]

Hi all,

I have several monitors, each with different resolutions, and when I create a 
frame I'd like to specify the font size (which is different to my main monitor).

I tried doing this

  (make-frame '(font "14"))

but it doesn't have any effect on the font size. Is there some other way to set 
the font size when I create a frame?

I'm currently manually running

  (set-frame-font "14")

which works, but is very awkward.

Best regards,
Sam