How to kill proportional Spacing on the &%$# Typesetter?

[Spyridon Triantafyllopoulos]

Me again!
Our IMAGEN Laser printers (itroff!) do pretty well on proportional
spacing, but can't pull it if I ask for straight (i.e., NON-proportional)
form. I can use "ipr" that lpr's on the laser printer, but can't control
fonts or anything else (nroff style). Am I missing something, a
control argument or a .whatever? Text comes out OK, but ask for a diagram
or a table and it proportions and looks like &%&%%&%$%#%. What I am
doing wrong?
Your response will be highly appreciated

-- Spiros                                      President,
-- USL Computer Science Dept.     The "Eliminate Managers from Science"
-- {ut-sally,akgub}!usl!sigma                Committee (:-)

PS: to all the folks who argued in straight lasering versus typesetting,
    you were right and me wrong. The typesetter is MUCH more convenient.