In 1875, while working on a harmonic telegraph, Alexander Graham Bell and Thomas Watson made an important discovery ... was transmitted at a different pitch. On June 2, 1875, while working in one room ...

On March 6, 1891, 44-year-old Alexander Graham Bell gave a speech at the ... a guiding tenant of her life,” writes Booth. In June of 1875, Bell wrote a letter to Mabel’s mother, confessing ...

During the years I spent in the company of Alexander Graham Bell ... from a wax inscription—contained a recording of Bell speaking. On June 20, 2012, at the Library of Congress, a team including ...

If Alexander Graham Bell were around today, that might be how he'd summon his intrepid assistant, Thomas Watson. Of course, for some oldheads that message might take a minute to decipher ...