My grandfather was a forensic scientist at the FBI- started the FBI crime lab as a matter of fact. Anyway, after he left the FBI he did handwriting consulting work. He would photograph samples with an 8X10, and in his basement he had an enormous horizontal enlarger that went through the wall of his darkroom. It was made from some sort of very large, probably 16X20 or so view camera, that was mounted on a cast iron rail system. Anyway, the light source was very similar to the one on ebay. It used 2 large carbon arc lamps as a light source. You had to manually adjust the elements to get the correct arc- very similar to welding actually. Made a bunch of noise, and left an ozone sort of smell. Very cool in a mad scientist kind of way. That thing on ebay looks like a smaller vertical version of the same kind of set up. I would love to see it in use.