setting geometry for new frame

[mandar.mitra]

Hello,

I've been trying to use make-frame to create a new frame at a specific
location as follows:

(make-frame '((left . +400) (top . +0)))

But when I type this in the scratch buffer, and do an eval, the newly
created frame doesn't follow my left and top specifications. Every
time, the new frame seems to be created at roughly the same location
relative to the initial frame.

Is there some way to position a newly created frame at a specific
location (as is done using the -geometry option of various X
commands)?

Thanks for any tips,
Mandar.