Tell about invention of Telephone ?

Now all they had to do was build a device with a suitable membrane capable of turning those tones into varying electronic currents and a receiver to reproduce the variations and turn them back into audible format at the other end

In early June, Bell discovered that while working on his harmonic telegraph, he could hear a sound over the wire. It was the sound of a twanging clock spring.

few years in the late 1800s, acoustic telephones were marketed commercially as a niche competitor to the electrical telephone. When the Bell telephone patents expired and many new telephone manufacturers began competing, acoustic telephone makers quickly went out of business.

It was on March 10th 1876 that Bell was to finally realise the success and communications potential of his new device.

Their maximum range was very limited.[2] An example of one such company was the Pulsion Telephone Supply Company created by Lemuel Mellett in Massachusetts, which designed its version in 1888 and deployed it on railroad right-of-ways.

According to Bell's notebook entry for that date, he describes his most successful experiment using his new piece of equipment, the telephone

The telephone emerged from the making and successive improvements of the electrical telegraph. In 1804, Spanish polymath and scientist Francisco Salva Campillo constructed an electrochemical telegraph

Alexander Graham Bell was born on 3rd March 1847 in Edinburgh, Scotland.

The first working telegraph was built by the English inventor Francis Ronalds in 1816 and used static electricity.[7] An electromagnetic telegraph was created by Baron Schilling in 1832. Carl Friedrich Gauss and Wilhelm Weber built another electromagnetic telegraph in 1833 in Göttingen.

The electrical telegraph was first commercialised by Sir William Fothergill Cooke and entered use on the Great Western Railway in England. It ran for 13 mi (21 km) from Paddington station to West Drayton and came into operation on April 9, 1839

He was groomed and educated to follow a career in the same specialty. By the age of just 29 in 1876 he had invented and patented the telephone.

electrical telegraph was independently developed and patented in the United States in 1837 by Samuel Morse. His assistant, Alfred Vail, developed the Morse code signaling alphabet with Morse. America's first telegram was sent by Morse on January 6, 1838, across 2 miles (3 km) of wiring.

His thorough knowledge of sound and acoustics helped immensely during the development of his telephone, and gave him the edge over others working on similar projects at that time. Bell was an intellectual of quality rarely found since his death.

Credit for the invention of the electric telephone is frequently disputed, and new controversies over the issue have arisen from time to time. Charles Bourseul, Innocenzo Manzetti, Antonio Meucci, Johann Philipp Reis, Alexander Graham Bell, and Elisha Gray, amongst others, have all been credited with the telephone's invention.

1876 - Alexander Graham Bell invents the telephone, beating Elisha Gray by a matter of hours.

he early history of the telephone became and still remains a confusing morass of claims and counterclaims, which were not clarified by the huge mass of lawsuits to resolve the patent claims of many individuals and commercial competitors. The Bell and Edison patents, however, were commercially decisive, because they dominated telephone technology and were upheld by court decisions in the United States

1877 - The very first permanent outdoor telephone wire was completed. It stretched a distance of just three miles. This was closely followed in the U.S. by the worlds first commercial telephone service.

1878 - The workable exchange was developed, which enabled calls to be switched between subscribers rather than having direct lines.

The modern telephone is the result of work of many people.[8] Alexander Graham Bell was, however, the first to patent the telephone, as an "apparatus for transmitting vocal or other sounds telegraphically". Bell has most often been credited as the inventor of the first practical telephone. However, in Germany Johann Philipp Reis is seen as a leading telephone pioneer who stopped only just short of a successful device, and as well the Italian-American inventor and businessman Antonio Meucci has been recognized by the U.S

1879 - Subscribers began to be designated by numbers and not their names.

The Elisha Gray and Alexander Bell telephone controversy considers the question of whether Bell and Gray invented the telephone independently and, if not, whether Bell stole the invention from Gray. This controversy is narrower than the broader question of who deserves credit for inventing the telephone, for which there are several claimants.

1880's - Long distance service expanded throughout this period using metallic circuits.

The Canadian Parliamentary Motion on Alexander Graham Bell article reviews the controversial June 2002 United States House of Representatives resolution recognizing Meucci's contributions 'in' the invention of the telephone (not 'for' the invention of the telephone). The same resolution was not passed in the U.S. Senate, thus labeling the House resolution as "political rhetoric". A subsequent counter-motion was unanimously passed in Canada's Parliament 10 days later which declared Bell its inventor.

1888 - Common battery system developed by Hammond V. Hayes, allows one central battery to power all telephones on an exchange, rather than relying on each units own battery.

The main users of the electrical telegraph were post offices, railway stations, the more important governmental centers (ministries), stock exchanges, very few nationally distributed newspapers, the largest internationally important corporations, and wealthy individuals.[10] Telegraph exchanges worked mainly on a store and forward basis. Although telephones devices were in use before the invention of the telephone exchange,