Alexander Graham Bell
Melville
Eliza
Sumner Tainter
Charles Thompson (as Dwight Peter Bacquie)
Glenn Curtiss
Thomas Watson
Helen Keller
Elisha Gray
Dr. Clarence Blake
William Orton
Tamblyn
Daisy
Susanna Hall
Casey Baldwin
Samuel Langley
Edward Gallaudet
Elsie Bell
Chauncy Smith (as Tony Groser)
Maid
Sarah Fuller
Arthur McCurdy
Girlfriend
Maude
Court Clerk
Miss Sullivan
Bert Grosvenor
John Fowler
Douglas McCurdy
Mabel Bell
Melville Bell
Young Alexander Graham Bell
Captain Keller
Mrs. Bethune
Gardiner Hubbard
US Patent Clerk
President Garfield
Lt. Selfridge