Which inventor demonstrated a telephone at Philadelphia’s 1876 Centennial Exposition, a predecessor to America250?

Alexander Graham Bell demonstrated a telephone at Philadelphia’s 1876 Centennial Exposition, a predecessor to America250.

The Centennial International Exhibition marked the 100th anniversary of the Declaration of Independence. Held in Fairmount Park from May 10 to November 10, 1876, it presented industrial machinery, agricultural equipment, consumer goods, and new technologies to a huge international audience.

Bell’s telephone was set up at opposite ends of Machinery Hall. Visitors could hear speech transmitted through the device, making the exhibit one of the fair’s most memorable demonstrations. Bell had received a patent for the telephone earlier in 1876, and the exposition helped bring public attention to the invention.

The fair also featured Thomas Edison’s automatic telegraph system, early typewriters, sewing machines, and electric equipment. The telephone demonstration is sometimes confused with later exhibitions of radio or electric lighting, but Bell’s device was specifically a voice-transmission telephone.