New York City had nearly a thousand millionaires in 1905, and seemingly everyone wanted to part them from their money. Cranks would frequently write a gigantic number on a piece of scrap paper and expectantly hand it to a bank teller, believing it was a sure thing. They were escorted from the building–and often sent to Bellevue. But in the waning days of the Gilded Age, some took things a step further, paying unannounced visits to the well-to-do in their mansions. Precautions were taken, which included howitzers. From an article in the November 12, 1905 New York Times:

…The Morosini mansion at Riverdale-on-the-Hudson is equipped with very extraordinary and picturesque apparatus as a proof against burglars and other unwelcome visitors. Several small-bore cannon and sundry howitzers are planted around the house, each piece of ordinance being connected with the house by an electric wire.

Whenever occasion demands, a button may be pressed inside the mansion, and any one or all of the cannon can be fired off. In addition to this novel safeguard the grounds surrounding the mansion can be illuminated by means of electric bulbs scattered thickly among the trees and shrubbery.

Recently there was occasion one night for the police to answer a call from the Morosini mansion, two servants having become obstreperous. As the vehicle containing two officers from the King’s Bridge Station passed through the gate, the lawn for a hundred feet about suddenly burst into light. Adjacent trees glowed with a hundred dazzling flashes. Surprised, the officers came to an abrupt halt. But presently continuing on toward the house, every foot of the way was similarly illuminated, lights budding everywhere, making the grounds almost as brilliant as day. During a subsequent survey of the premises the police learned that all the windows on the ground floor were connected with heavily charged electric wires. When the family retires a switch is turned on, and any one attempting to open a window from the outside is apt to be fatally shocked.•