While at college he invented two automatic railroad car couplers and a ballot box to register votes and prevent fraud at the polls.

After finishing his education he traveled in the United States, Europe, northern Africa, Mexico, Central America, Yucatan, the West Indies and the Bermudas.

He collected paintings, old armor, ancient pottery, old ivories, primitive glassware and objets d'art while living in London for seventeen years after his marriage.

He claimed to have invented an aerial torpedo, motorcycles, eyeglasses for looking backward while driving, a watch which shows the time the world over, an electric rotary brush, an electric rotary razor, an apparatus to locate vessels in a fog at sea, a boat which will not rock in rough water, a quadricycle to lessen vibration upon rough roads, an hydroplane for skimming over the surface of the water, an ambulance to prevent shock or vibration to its occupant, an audiophone for theatre use, a water cycle, a scheme to bridge the English Channel, and finally at the end of the World War I an improvement in war tanks, which came just as hostilities ended.

[2] In sculpture his principal works were a three-quarter-life sized statue entitled "Sapho" one of "Victory," and a figure emblematic of "The Birth of a Spirit."

[6] Together, Hamilton and Constance were the parents of three sons:[7] He died on February 2, 1934[1] and was buried at Woodlawn Park Cemetery in Miami, Florida.