Huang, Houming (2002). "Prehistoric Music Culture of China". Cultural Relics of Central China (3): 18–27. ISSN 1003-1731. Fenster, Julie M. (March 7, 2006). "Inventing the Telephone—And Triggering All-Out Patent War". American Heritage. Archived from the original on March 11, 2006 . Retrieved September 19, 2015.

Rossing, Thomas (2000). Science of percussion instruments. Singapore River Edge, N.J: World Scientific. ISBN 978-981-02-4158-2. OCLC 45679450. Alexander Graham Bell – Lab notebook pp. 40–41 (image 22)". Quotegrab. IAP Quotegrab. August 2, 2019. Archived from the original on May 14, 2020 . Retrieved September 17, 2019. Another related ancient Chinese musical instrument is called qing ( 磬 pinyin qìng) but it was made of stone instead of metal.Webb, Michael, ed. (1991). Alexander Graham Bell: Inventor of the Telephone. Mississauga, Ontario: Copp Clark Pitman. p. 15. ISBN 978-0-7730-5049-5. The first two-way (reciprocal) conversation over a line occurred between Cambridge and Boston (roughly 2.5 miles) on October 9, 1876. [100] During that conversation, Bell was on Kilby Street in Boston and Watson was at the offices of the Walworth Manufacturing Company. [101] Bell at the opening of the long-distance line from New York to Chicago in 1892 a b Bruce, Robert V. (March 15, 2020). "Bell: Alexander Graham Bell and the Conquest of Solitude". Plunkett Lake Press – via Google Books. Bell, Mabel (October 1922). "Dr. Bell's Appreciation of the Telephone Service". Bell Telephone Quarterly. 1 (3): 65 . Retrieved September 18, 2015. Rubino, Anthony (2010-03-18). Why Didn't I Think of That?: 101 Inventions that Changed the World by Hardly Trying. Simon and Schuster. ISBN 978-1-4405-0698-7.

Bell Satellite TV provides a great variety of HD and 4K channels, the best receivers and the best image quality – making it the leader in digital satellite TV service in Canada. The latest cell phones, Mobile Internet devices, smartwatches and tablets Matthews, Tom L. (1999). Always Inventing: A Photobiography of Alexander Graham Bell. Washington, D.C.: National Geographic Society. pp.19–21. ISBN 978-0-7922-7391-2.In 1865, when the Bell family moved to London, [41] Bell returned to Weston House as an assistant master and, in his spare hours, continued experiments on sound using a minimum of laboratory equipment. Bell concentrated on experimenting with electricity to convey sound and later installed a telegraph wire from his room in Somerset College to that of a friend. [42] Throughout late 1867, his health faltered mainly through exhaustion. His younger brother, Edward "Ted", was similarly affected by tuberculosis. While Bell recovered (by then referring to himself in correspondence as "A. G. Bell") and served the next year as an instructor at Somerset College, Bath, England, his brother's condition deteriorated. Edward would never recover. Upon his brother's death, Bell returned home in 1867. His older brother Melville had married and moved out. With aspirations to obtain a degree at University College London, Bell considered his next years as preparation for the degree examinations, devoting his spare time at his family's residence to studying. Fletcher, N.H.; Rossing, T. (2008). The Physics of Musical Instruments. Springer New York. ISBN 978-0-387-98374-5.