From the OHS PC Database, derived from A Guide to North American Organbuilders by David H. Fox (Organ Historical Society, 1991) —

Worcester, M.assachusetts.

From the OHS Database Builders Listing editor, April 19, 2016 —

Englishman James-Baille Hamilton invented the Vocalion Organ, a reed organ using pressure instead of suction, but was unable to find an interest for it in England. He moved to the U.S. and started production with the Hamilton Vocalion Organ Mfg. Co. beginning in 1886. By 1890, there were changes in business arrangements and the company was associated with the Canadian firm, Mason and Risch. The company maintained locations in Worcester and New York for the Vocalion. These were sold by the New York Church Organ Company. By 1903 Aeolian acquired the
company and production ceased somewhere around 1910.

Source: The Vocalion Group, a website maintained by the Carey Organ Company, Inc., of Troy, New York. http://www.sgeinc.com/~franktau/History.html. Accessed April 26, 2016.