horizontal milling machine
My small "Armor" horizontal milling machine manufactured in the late 1940's by the Aircraft Machinery Company of Burbank, CA.
This particular horizontal milling machine is not a usual specimen since there is no knee. Instead the entire spindle assembly moves up and down the column on a leadscrew. I am not sure if this is an improvement over the normal knee or not, but it does seem to have above average rigidity for a small mill. Perhaps this is typical of the horizontal variety in general, I don't have enough experience with small vertical milling machines to tell.