Title: Telephone History - Invention of the Telephone
Headings: 

Content: But by 1964 a complete experimental system, the "Mod 1," had been developed. To  test it, the public was invited to place calls between special exhibits at Disneyland and  the New York World’s Fair. In both locations, visitors were carefully interviewed  afterward by a market research agency. People, it turned out, didn’t like  Picturephone. The equipment was too bulky, the controls too unfriendly, and the picture  too small. But the Bell System was convinced that Picturephone was viable. Trials went on  for six more years. In 1970, commercial Picturephone service debuted in downtown  Pittsburgh and AT&T executives confidently predicted that a million Picturephone sets  would be in use by 1980. What happened? Despite its improvements, Picturephone was still big, expensive, and  uncomfortably intrusive.