The telephone and answering machines - Deepstash
Centers of Progress

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The historical significance of urban centers

The impact of cultural and technological advances

The role of urban centers in shaping society

Centers of Progress

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The telephone and answering machines

The next idea to explore was finding a way to transmit sound to far distances. Alexander Graham Bell laid out the underlying technology for electromagnetic telephones and was granted a patent in 1876 for his improvements in telegraphy.

This introduced a new problem: what if you were not available if someone tried to call you? At the turn of the 20th century, Danish inventor Valdemar Poulsen invented the telegraphone, a device for recording and playing back the magnetic fields produced by sound.

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The phonetic system

  • The phonetic system does not use pictorial signs but symbols to refer to spoken sounds. Modern alphabets that many people in the world use today represent a phonetic form of communication.
  • Remnants of these systems appeared either around 19th century B.C. from the early Canaanite p...

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The invention of paper and moveable type

  • In 105 China, an official Cai Lung suggested using "the bark of trees, remnants of hemp, rags of cloth, and fishing nets" for writing on instead of heavier bamboo or costlier silk material.
  • The Chinese followed that up with the invention of the first clay moveable type for printing...

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Long-distance communication

  • The Greeks used messenger pigeons to deliver the results of the first Olympiad in the year 776 B.C. They also established a library in 530 B.C.
  • Near the end of the B.C. period, systems of long-distance communication became more commonplace. In Egypt and China, messenger relay stati...

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Written communication during the BCE Years

Written communication during the BCE Years

The Kish tablet is dated to 3500 B.C. and is considered by some experts to be the oldest form of known handwriting. It features proto-cuneiform signs - symbols that resemble a physical object. The Egyptian hieroglyphs are similar to this form of writing and date back to 3200 B.C.

Written l...

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The telegraph and Morse code

In 1835, inventors Joseph Henry and Edward Davey independently demonstrated electromagnetic relay, where a weak electrical signal can be amplified and transmitted across long distances. Cooke and Wheatstone invented the telegraph shortly after.

A few years later, Samuel Morse developed a v...

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TELEPHONE

TELEPHONE

Alexander Graham Bell invented a technology that would later bear his name. But how much did he deserve it? 

The problem that Bell solved was to turn electrical signals into sounds. 

Philip Reis had already designed a sound transmitter in 1860, and Hermann Lud...

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