In 1911, Hamilton teamed up with Ted Geary, a young yacht designer, to create a number of unique seaplane designs that were seen around Seattle's Lake Washington and various aerial demonstrations of the day. The total number of known aircraft built by Hamilton's Seattle company is estimated to be around 10 to 25 aircraft, though a more accurate account of his aircraft built during the 1909 to 1914 period is yet unknown. His designs were a combination of other designs of the era and his own unique ideas incorporated into the aircraft.
In 1911, Hamilton teamed up with Ted Geary, a young yacht designer, to create several unique seaplane designs that were shown around Seattle's Lake Washington and various aerial demonstrations of the day. The total number of aircraft produced by Hamilton's Seattle company is estimated at between 10 and 25, though an accurate count for his work during the 1909-1914 period remains unknown. His designs combined other era models with his own innovative ideas.