Meucci devises his first electromagnetic telephone.
Meucci devises his first electromagnetic telephone.
Reis demonstrates a telephone
Reis demonstrates a telephone
Dolbear invents early telephone receiver
Dolbear invents early telephone receiver
Edison telegraph stock ticker printer launches
Edison telegraph stock ticker printer launches
Western Union deploys the Stearns Duplex Telegraph
Western Union deploys the Stearns Duplex Telegraph
Elisha Gray demonstrates his 'harmonic telegraph' to Western Union
Elisha Gray demonstrates his 'harmonic telegraph' to Western Union
Edison develops the quadruplex multiplexing telegraph
Edison develops the quadruplex multiplexing telegraph
Bell pitches his harmonic telegraph to Western Union's Orton, who declines
Bell pitches his harmonic telegraph to Western Union's Orton, who declines
Bell uses a bi-directional "gallows" telephone to transmit "voice-like sounds"
Bell uses a bi-directional "gallows" telephone to transmit "voice-like sounds"
Alexander Graham Bell realizes sound can be transmitted as a continuous electrical wave.
Alexander Graham Bell realizes sound can be transmitted as a continuous electrical wave.
Phelps' "Electro-Motor Printing Telegraph" enables 60 WPM speed
Phelps' "Electro-Motor Printing Telegraph" enables 60 WPM speed
Feb 14, 11:30am: Alexander Graham Bell's lawyer files his telephone patent
Feb 14, 11:30am: Alexander Graham Bell's lawyer files his telephone patent
Feb 14: Elisha Gray files telephone caveat
Feb 14: Elisha Gray files telephone caveat
Western Union begins paying Edison to develop a 'speaking telegraph"
Western Union begins paying Edison to develop a 'speaking telegraph"
Bell's box phone goes into service
Bell's box phone goes into service
Brown profs swap bar magnet for Bell's horseshoe magnet, enabling butterstamp telephones
Brown profs swap bar magnet for Bell's horseshoe magnet, enabling butterstamp telephones
First telephone line completed, between Charles Williams Jr's home and office
First telephone line completed, between Charles Williams Jr's home and office
Thomas Edison patents his carbon button transmitter
Thomas Edison patents his carbon button transmitter
Berliner files caveat for improved telephone transmitter
Berliner files caveat for improved telephone transmitter
Scientific American write-up of Bell's hand telephones
Scientific American write-up of Bell's hand telephones
Doolittle invents hard drawn copper wire
Doolittle invents hard drawn copper wire
Holmes Burglar Alarm of Boston installs first telephone exchange
Holmes Burglar Alarm of Boston installs first telephone exchange
Doolittle files patent for 'direct-connecting' switchboard
Doolittle files patent for 'direct-connecting' switchboard
Puskás designs first telephone exchange
Puskás designs first telephone exchange
Watson invents a ringer that 'thumps'
Watson invents a ringer that 'thumps'
Coy opens the first telephone exchange (in New Haven)
Coy opens the first telephone exchange (in New Haven)
Blake invents and patents his carbon microphone transmitter
Blake invents and patents his carbon microphone transmitter
Watson invents a ringer that rings
Watson invents a ringer that rings
Bell turns his focus to the Photophone
Bell turns his focus to the Photophone
Metallic circuit introduced
Metallic circuit introduced
Doolittle builds the first long distance copper wire circuit (NY to Boston)
Doolittle builds the first long distance copper wire circuit (NY to Boston)
Woods patents improved telephone transmitter
Woods patents improved telephone transmitter
Puskas introduces the multiplex switchboard
Puskas introduces the multiplex switchboard
Heaviside discovers inductive loading for telephone lines
Heaviside discovers inductive loading for telephone lines
Almon Strowger invents the automatic switch
Almon Strowger invents the automatic switch
Gray patents the coin-operated payphone
Gray patents the coin-operated payphone
First Strowger automatic exchange opens (in LaPorte, Indiana)
First Strowger automatic exchange opens (in LaPorte, Indiana)
First 'common battery' central office (Lexington, Mass.)
First 'common battery' central office (Lexington, Mass.)
Columbia Dry Cell Battery introduced, making liquid phone batteries obsolete
Columbia Dry Cell Battery introduced, making liquid phone batteries obsolete
Poulsen invents magnetic recording for telephones
Poulsen invents magnetic recording for telephones
Pupin loading coils patented
Pupin loading coils patented
