The building was brightly lit at night (Edison's contribution) and attracted a huge number of visitors. This was a massive building, partly designed by Thomas Edison , and featured (what was said at the time to be ) hundreds of Mills slot machines, it was the only free attraction at the worlds fair but probably made more money than any other. So much so he was given the task of running the Mills Spectatorium at the 1904 World Fair in St Louis. In his late 20's he went to work for the Mills Novelty Co where his natural engineering ability soon made him an expert on coin-operated machines. Ode Jennings was born in Kentucky in 1874.
See a Selection of the More Complex Machines at Work.Coin Operated Related Seaside Postcards.