GENERAL KNOWLEDGE

Detailed explanation-1: -On March 7, 1876, 29-year-old Alexander Graham Bell receives a patent for his revolutionary new invention: the telephone. The Scottish-born Bell worked in London with his father, Melville Bell, who developed Visible Speech, a written system used to teach speaking to the deaf.

Detailed explanation-2: -The marker reads, “Birthplace of the Telephone. Here, on June 2, 1875, Alexander Graham Bell and Thomas A. Watson first transmitted sound over wires. This successful experiment was completed in a fifth floor garret at what was then 109 Court Street and marked the beginning of world-wide telephone service."

Detailed explanation-3: -How was the telephone invented? Bell in 1876, aged 29.