This description taken from the 'Monotype Book of Information' by David Bolton of the Alembic Press
The Monotype Composition caster produces composed lines of individual pieces of type, from 4½ to 14pt bodies, and to a maximum line length of 60 picas. It is controlled by a punched paper tape, and runs from 45 to 180 rpm, depending upon body size. With appropriate attachments, it will produce composed type up to 24pt, and display type (sorts) to 36pt, and go down to a speed of 9 rpm. It can also produce mathematics, Arabic, Hebrew, etc., and lead and rule from 1½pt to 12pt. Its overall weight is 1522lbs and working floor area is 9 sq ft.
The Monotype Type and Rule caster is similar to the Composition caster, but does not have the paper tape control mechanism, and so only casts individual sorts. Sizes from 4½pt to 36pt, and speed from 45 to 180 rpm (down to 9 rpm with low speed and Varigear). It can cast lead and rule from 1½pt to 12pt. It weighs 1326 lbs and its working floor area is 9×10 ft.
The Monotype Super caster produces individual type sorts from 4½pt to 72pt, at speeds from 4½ to 144 rpm (or 2 to 160 rpm with Varigear). With appropriate attachments, it can cast Palace Script, quotations, continuous border, swelled rule, lead and rule from 1pt to 18pt, and strip furniture from 24pt to 72pt. It weighs 1484 lbs and its working floor area is 8 ft sq.