Samuel Morse
In addition to the telegraph, Morse invented a marble-cutting machine that could carve three-dimensional sculptures in marble or stone. He could not patent it, however, because of an existing 1820 Thomas Blanchard design.
William Francis Channing
Samuel Morse invented the telegraph in 1837 and commercial usage was begun in 1844.
Channing spun off this technology to create a citywide fire alarm system. With the assistance of Professor Farmer, an electrical engineer, they developed a fire-alarm telegraph. They talked the officials of Boston into financing the construction of a citywide fire alarm system. The first central office was located at 21 Court Square. The city owned the building. The system began testing on 28 April 1852. The first fire alert was received the very next night. Channing and Moses obtained a patent on this electrical telegraph system on 19 May 1857. It was US Patent #17,355 and known as the American fire-alarm telegraph or the "city system."