When And Who Invented It
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Telephone
When and Who Invented It • Alexander Graham Bell at the age of 29 • It was invented on March 7, 1876.
What it does and how its used. • Telephone is a • The device telecommunication operates principally s device that by converting transmits and sound waves into receives sound, electrical signals, most commonly and electrical the human voice signals into sound waves
What led up to the invention Multiple Telegraph Harmonic Telegraph Wire based Telegraph
What has came after • • • • •
Answer Machine Tv Computers Internet Cell phones
When and Who Invented It • Alexander Graham Bell at the age of 29 • It was invented on March 7, 1876.
What it does and how its used. • Telephone is a • The device telecommunication operates principally s device that by converting transmits and sound waves into receives sound, electrical signals, most commonly and electrical the human voice signals into sound waves
What led up to the invention Multiple Telegraph Harmonic Telegraph Wire based Telegraph
What has came after • • • • •
Answer Machine Tv Computers Internet Cell phones
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