I did "Lost wax casting" in High School. It was for an Art elective, had to have one to graduate, I was the only one in the class who had come from the Metal Shop program. Basically my teacher outlined what the projects were and he let me run. Bronze was my metal of choice, silver and gold being too expensive when I was 17.
We had a Dentist's centrifuge. Basically you melted the metal in a pot and released the arm on the "fuge" and centifical force would inject the molten metal into the casting, after you had melted out the wax. I still have the bronze ring I maid. Very little cleanup, basically just the sprues had to be cut and filed and sanded to finish.
That's the major points I remember, unfortunately its been just a litttle over 20 years ago. Hope this helps you out.