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Sunday, February 12, 2023

Basic timeline of the telephone

This post is a basic timeline of the telephone. There are 24 innovations listed below chronologically.

• 7th cen AD: acoustic string phone in Peru
• 1667: acoustic string phone created by Robert Hooke
• 1804: electrochemical telegraph
• 1816: working telegraph
• 1839: commercial telegraph
• 1854: Meucci telephone
• 1861: Reis telephone
• 1875: electro-dynamic receiver
• 1876: water microphone telephone
• 1876: practical telephone
• 1877: carbon transmitter
• 1877: long-distance telephone line
• 1878: commercial telephone exchange
• 1887: multiplex switchboard
• 1890s: candlestick telephone
• 1892: rotary dial
• 1927: transatlantic phone call
• 1957: transatlantic direct dial phone call
• 1963: Touch-Tone
• 1973: cell phone
• 1973: Voice over Internet Protocol
• 1980: CMOS PCM codec-filter chip
• 1992: smartphone
• 2007: iPhone

Sources

Wikipedia: History of the telephone, Dual-tone multi-frequency signaling, International direct dialing, Rotary dial, Smartphone, Voice over IP