I managed to rescue and restore one of these bells from a turn of the century Ohio school house. There was one of these on each floor of the four floored school. Outside the principal’s office was a switch plate with brass extension/handle that read Fire 4 rings. The system was connected via a 3/8 inch brass pipe fed through a 1 inch conduit. AT the top of each wall was a brass switch plate with an extension that protruded through the hole in the bell lever near the Vanduzen trademark. AN up down motion would trigger the bell. The 16 inch diameter bell gongs were painted in 8 coats of paint. I blasted them off and had a polishing shop shine it up. It has a 6 1880 patent date as seen in picture. Any information on it would be nice.
You have gathered much information about it’s operation already. Have you tried researching the patent online? There’s a lot of info about Buckeye Bell Foundry (Vanduzen) in the search here (above right). What kind of fool paints a bronze bell???