The man who invented the telephone refused to keep one in his study. This deep dive argues that Alexander Graham Bell saw himself first as a teacher of the deaf, and that everything else he achieved grew out of a lifelong obsession with the physics of sound, family tragedy, and his deaf mother and wife.

We follow him from his father’s Visible Speech system in Edinburgh and the talking dog he trained, through a mistranslation of Helmholtz that convinced him electrical speech was possible, tuberculosis that drove his family to Canada, and the multiplex telegraph research in Boston that led to the 1876 patent race with Elisha Gray. We also weigh his contested legacy as an advocate of oralism.

• Speaking against his mother’s forehead: Bell’s early, intuitive use of bone conduction
• How a single plucked reed on June 2, 1875 showed one membrane could carry complex sound
• The Valentine’s Day 1876 filings by Bell and Elisha Gray and what they reveal about patent law
• The photophone, which sent a voice 700 feet on a beam of light and which Bell called his greatest achievement
• Why his support for lip reading over sign language remains heavily debated in the deaf community