Ook wrote:
The previous owner of the house I own replaced the main beam. The beam is
supported by 4-5 metal supports that appear to be adjustable. The floor in
the main level of the house slopes upwards towards where the beam, by as
much as an inch or two. I'm thinking that I can lower the main beam by an
inch or so and level the floor. Does this sound feasible? Is this a very bad
thing to do, or might I be sucessfull in leveling the floor without hurting
anything?

"without hurting anything?" Probably not, but if you are patient and
go really slow backing the jacks down it might be minimal. By slowly I
mean months or years. If they are screw jacks & you give each one a 1/4
turn once a month it would eventually hit the level you want, maybe
without putting big cracks in the walls.