HD-4 or Hydrodome number 4, was an early research hydrofoil watercraft, developed by which scientist, who was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone, and founding the American Telephone and Telegraph Company (AT&T), in 1885?
HD-4 HD-4 or Hydrodome number 4 was an early research hydrofoil watercraft developed by the scientist Alexander Graham Bell. It was designed and built at the Bell Boatyard on Bell's Beinn Bhreagh estate near Baddeck, Nova Scotia. In 1919 it set a world marine speed record of 70.86 mph .
Charles Bourseul Charles Bourseul (28 April 1829 – 23 November 1912) was a pioneer in development of the "make and break" telephone about 20 years before Bell made a practical telephone.