Alexander Graham Bell (sitting in New York, speaking into a telephone):
"Mr Watson, come here. I want you."
Mr. Watson (Bell's assistant, listening in on a telephone in San Francisco):
"It will take me five days to get there now!"
Prior to this history-making call, a trial phone call had already taken place in July, 1914, when Theodore Vail, the president of AT&T, spoke coast to coast with his voice being boosted in Pittsburgh, Omaha, and Salt Lake City. The company had been wanting to link the two coasts via phone, and finally found a device to make that possible - Lee DeForest's "audions," the first vacuum tubes. (pbs.org, "A Transcontinental Telephone Line")
If you have an interest in the technology that made this event possible, we invite you to stop by the Bullis Room and spend some time with these century-plus old books:
The History of the Telephone
by Herbert Newton Casson
published in Chicago by A. C. McClurg, 1911
and
The Telephone: An Account of the Phenomena of
Electricity, Magnetism, and Sound, as Involved in its Action.
With Directions for Making a Speaking Telephone
by A. E. Dolbear
published in Boston by Lee & Shepard, 1877