Laira Green Primary School

Tel: 01752 660427 Email:laira.green.primary.school@plymouth.gov.uk Bramley Rd, Laira, Plymouth, PL3 6BP

Home Learning – Birch Class

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Timeline of how the ‘telephone’ has improved to its modern self.

  • 1849: Antonio Meucci demonstrates a communicating machine to people in Havana. It is disputed if this is an electric telephone, but is said to involve direct transportation of electricity into the user’s body.
  • 1854: Charles Bourseul made a description of a practical telephone transmitter and the receiver ( in Paris) but does not create a working instrument.
  • 1854: Meucci demonstrates an electric voice-operated device in New York, but it is not clear what kind of device he demonstrated.
  • 1861: Johann Philipp Reis manages to transfer voice electrical waves over a distance of 340 ft, with his Reis telephone. Reis used his telephone to send his phrase “The horse does not eat cucumber salad”. This phrase in German is hard to understand so Reis uses it to prove that speech can be recognized at the receiving end.
  • 1864: in an attempt to give his musical gadget a voice, Innocenzo Manzetti invents the ‘speaking telegraph’. He shows no interest in patenting his device, but it is reported in newspapers.
  • 1865: Meucci reads of Manzetti’s invention and writes to the editors of two newspapers c laiming his goal and noting his first experiment in 1849. He writes “I do not wish to deny Mr. Manzetti his invention, I only wish to see that two thoughts could be found to contain the same discovery, and that by uniting the two ideas one can more easily reach the certainty about a thing this important.” If he reads Meucci’s offer of partnership, Manzetti does not respond.
  • 1871: Meucci files a patent advice (on account of his aim to file a patent application) for a Sound Telegraph, but it does not describe an electromagnetic telephone.
  • 1872: Professor Vanderwyde test Reis’s telephone in New York.
  • July 1873: Thomas Edison notes struggle in carbohydrate on grains due to pressure; builds electricity based on the basics, but leaves it because of its awareness to vibration.
  • May 1874: Gray invents electric magnet device for sending musical tones. Some of his receivers use a gold/silver disc.
  • 29 December 1874: Gray test his musical tones device and that it sent “familiar melodies through telegraph wire” at the Presbyterian Church in Highland Park, Illinois.
  • 4 May 1875: Bell’s opinion of using many resistances in a wire to send a direct electric current to make a mass of the current.
  • 2 June 1875: Bell sends a sound of a plucked steel stick using electric magnet instruments.
  • 1 July 1875: Bell uses a two way “gallows” telephone that was able to send “bleared but voice-like sounds” but not clear speech. Both the sender and the receiver were identical sheath electric magnet instruments.
  • 1875: Thomas Edison experiment, with a natural telegraphy and in November builds an electric motion receiver but does not adventure it.

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