EARLIER ,MESSAGES SENT TO SOMEONE WHO WAS OUT OF VISUAL AND HEARING RANGE was with the help of signals using smoke ,jungle drums, etc.The North Americans Indians communicated with smoke signals in the vast prairie and the dwellers of African forest used jungle drums ,But the range of these methods was very limited.In the 19th century , electricity was used successfully to transfer messages .This was done through Morse code, via telephone ,and now a days with the help of computers.
MORSE CODE- Morse code is a method of transmitting electrical signals that are combinations of long and short sounds .Flashes of light or electrical pulses that flashes -like a torch ,that flick on or off.To understand the message , the code must be known ; ,the Morse alphabet .Samuel Morse an American , invented it in 1833..The alphabets consists of dots and dashes .A dot stand for short signal , a dash for long signal. An S is written as ..., an O as - - -.This means the emergency signal SOS is '. . ._ _ _. . ._three dots ,three dash,,three dots .Amateur radio operators and telegraphy use this Morse code now a days.
TELEPHONE- TELEPHONE works on the fact that ,like all sounds ,speech also consists of sound waves.The mouthpiece of the telephone has a microphone , which converts the spoken sounds into electric currents .The transmissions of electric current is done through wires.In the earpiece , the electric current is converted back to sound waves .Earlier ,the wires were made of copper, but today telephonic conversation are transmitted through glass fibre cables or even via satellite connection.Telephonic calls over long distance were earlier possible only through telephone operators..Since 1970 ,we can make oversea calls directly.This device was invented by Graham Bell.
COMPUTER -e-mails - Electronic mail or in short e-mail is send through computer.One needs access to the internet .One can get access rby paying money to the internet service provider .One ,also need e-mail address of the receiver.The e-mail starts ,when ' send ' is pressed from the sender's e-mail account .The e- mail then goes to the service provider,who sends from one ' node ' to another,before it reaches to its destination.It may happens that that an e-mail sent from America goes to Britain then to India and finally reaches to the person, whom it may be sent.
Interesting facts
MORSE CODE- Morse code is a method of transmitting electrical signals that are combinations of long and short sounds .Flashes of light or electrical pulses that flashes -like a torch ,that flick on or off.To understand the message , the code must be known ; ,the Morse alphabet .Samuel Morse an American , invented it in 1833..The alphabets consists of dots and dashes .A dot stand for short signal , a dash for long signal. An S is written as ..., an O as - - -.This means the emergency signal SOS is '. . ._ _ _. . ._three dots ,three dash,,three dots .Amateur radio operators and telegraphy use this Morse code now a days.
TELEPHONE- TELEPHONE works on the fact that ,like all sounds ,speech also consists of sound waves.The mouthpiece of the telephone has a microphone , which converts the spoken sounds into electric currents .The transmissions of electric current is done through wires.In the earpiece , the electric current is converted back to sound waves .Earlier ,the wires were made of copper, but today telephonic conversation are transmitted through glass fibre cables or even via satellite connection.Telephonic calls over long distance were earlier possible only through telephone operators..Since 1970 ,we can make oversea calls directly.This device was invented by Graham Bell.
COMPUTER -e-mails - Electronic mail or in short e-mail is send through computer.One needs access to the internet .One can get access rby paying money to the internet service provider .One ,also need e-mail address of the receiver.The e-mail starts ,when ' send ' is pressed from the sender's e-mail account .The e- mail then goes to the service provider,who sends from one ' node ' to another,before it reaches to its destination.It may happens that that an e-mail sent from America goes to Britain then to India and finally reaches to the person, whom it may be sent.
Interesting facts
- SOS stands for 'save our souls' or'save our ships'the emergency signal was radioed for the first time in 1909 by a ship near,Azores islands.
- ways of communications
- The election of new pope is still announced with smoke signals.If white smoke is seen ,it means that the new pope is elected;black smoke means the cardinals are still deliberating.
- ways of communications
- The character @ has been included in the international Morse alphabet only in the year 2004.
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