I recently acquired an old forge from a mine in northern idaho. The nameplate says Sullivan machinery co. Chicago. Class gf2, (I think, its kinda buggered up), Shop number 1226 It was diesel fired. Its pretty big, must weigh a couple hundred pounds. It has a pretty large opening, maybe 3 feet long by foot and a half tall when top is on it. The diesel was fed in along with compressed air. Its lined with a lot of firebrick. That's all I know about it, anyone seen or have one like this. I just want to know more about it. I might try to use propane in it and get it running again.

Unless you are independently wealthy I would not try running propane in that beast!

I use a diesel and firebrick forge. It takes a bit to heat up but then it works great. I just try to do work that will take a while like all day, not one or two little things. Buy red diesel and run it.
Rob