Занимательная физика в вопросах и ответах.
Сайт  Елькина Виктора.
   Заслуженный учитель РФ.   Учитель-методист. 
     Занимательная  физика    А знаете ли Вы?    Физика в походе    Биофизика    Биографии   Астрономия  
 Физика  и  поэзия    Физика и медицина    Народная мудрость    Необычные  явления   Ссылки
Занимательные  опыты   Радиотехника  для  всех   Бочка Паскаля   Оптика   Шаровая молния  Сообразилки

STORIES  OF  INVENTIONS   AND  DISCOVERIES

Telephone

Invented by: Alexander Graham Bell
Nationality: Scottish
Date: 1876
 
     Alexander Graham Bell was a doctor. He workea with deaf children and understood the way sounds caused vibrations.
     While only in his 20's, he discovered a way of converting vibrations into variations in electric current - and back again.
     His telephone had a diaphragm (a thin metal sheet) which vibrated when spoken to; close behind the diaphragm was an electromagnet which converted the vibrations into electric signals.
     Bell's telephone had a single transmitter  receiver: when you had finished speaking into the microphone you held it to your ear and listened to the other person's voice.
     In 1877, Thomas Edison invented a better, separate, microphone using carbon granules behind the diaphragm. Apart from that, today's telephone is as Bell invented it.
Hosted by uCoz
Hosted by uCoz
< face="Arial">

   


Найти:

на:

Hosted by uCoz
ca, Helv" size=1>

[AD] 

[AD] 

Предлагаем обменяться ссылками.
 
Выберите  баннер  
 
       © 2003 - 200 Елькин В.И.

Slobodskoy 


Mikhail
Lomonosov

Albert Einstein 

Alexander Fleming

Igor Kurchatov

Poytr Lebedev

Marie Curie


 
  Electric Light Bulb
 
Tape Recorder
(and Walkman)

Television

Cameras  in the Beginning

Aqualung

Telephone 2

The Radio

 



Hosted by uCoz