r u familiar with http://vintagemachinery.org/ the woodworking machinery pages r the best. good luck
Branson is correct but if it is 5 hp you better check that your elect panel will need a dedicated breaker/dual breakers, you will need a 40 amp 240VAC breaker and the motor will draw 22 amps under no load, locked rotor /startup will be significantly higher for a few seconds. It is also possible that it is 3 phase and that is another ball of wax.
Don't get in over your head there are plenty of 110/120 VAC saws available at a good price and don't need any special attention. Of course if you want a learning project I think you just met a possible challenge. Good luck with that one --- it's kool but I wouldn't touch it with a ten foot pole, not even if it was free. JMHO -- If you really need a saw buy something that will run on existing elec available. If you want a long term project I think you found it. Old is Kool but "Function Rules" if you need to use it.
BTW I work with a guy who worked in a mill for ten years in the 60s/70s and he said that it probably used in a mill but it was a very small saw and he had never seen one that small actually in the mill he worked in northern CA. He said for normal everyday use and possible transportability to a job site it was pretty useless for a regular guy doing regular construction work. It's a fun project tho