DynamophoneArkiverad 2 mars 2009 hämtat från the Wayback Machine. lvc.edu, 'US Patent no. 580.035, registered by Thaddeus Cahill (1867-1934) in 1897'
synthmuseum.com
Thaddeus Cahill's Telharmonium Jay Williston, synthmuseum.com. 2000, 'specification...dated April 6, 1897', 'application filed February 4, 1896', 'weighed about 7 tons in all', 'By 1906 the new Telharmonium...weighed almost 200 tons'
web.archive.org
DynamophoneArkiverad 2 mars 2009 hämtat från the Wayback Machine. lvc.edu, 'US Patent no. 580.035, registered by Thaddeus Cahill (1867-1934) in 1897'