History of the telephone from the 1880s to current time electricity merit badge worksheet


One of the best-known examples of this technology is called the tin can telephone, also known as the lover’s phone. It’s the same types of “phones” you created in elementary school when you were younger: you connect two tin cans (or “diaphragms”) using a taut string or wire. f gas certification logo The mechanical vibrations from your voice travel down the wire before being converted back into sound energy at the other end of the line.

In 1804, Catalan scientist and inventor Francisco Salva Campillo created an electrochemical telegraph. In 1832, Baron Schilling improved upon the device. Two German inventors created their own electromagnetic telegraph in 1833. The first working electrical telegraph, however, wasn’t put into place until April 1839 when it was constructed on the Great Western Railway in England.

Why did we need electrical telegraphs before the telephone? Well, both the telephone and the telegraph are wire-based electrical systems. The telegraph also paved the way for later telephone inventors. electricity physics ppt As About.com explains, “Alexander Graham Bell’s success with the telephone came as a direct result of his attempts to improve the telegraph.”

• Alexander Graham Bell: Bell received the first US patent for the invention of the telephone in 1876. Bell used his own musical or harmony approach as a practical solution to the telegraph’s problems – Bell’s harmonic telegraph was based on the idea that several notes could be sent along the way simultaneously as long as the notes or signals had different pitches.

There has been a significant amount of controversy over the years over whether Bell or Gray invented the phone. The controversy actually went before the Canadian Parliament and United States House of Representatives at one point. gas leak los angeles california I’m not going to go into huge detail here because it’s outside the scope of this article, but you can read up on the Elisha Gray and Alexander Bell telephone controversy here.

Transcontinental telephone service, however, remained elusive in the 19th century. Building a wire across the entire length of America didn’t seem practical given the low populations and huge distances out west. Thus, transcontinental service was not established until 1915, when it was completed by overhead wire. The First Telephone Switchboards

The first rotary dial was invented in 1896. Prior to that, telephone owners would have to push a button on their telephone the required number of pulses by tapping in order to call a number. grade 6 electricity test Understandably, the rotary dial was seen as a superior alternative to this system. By 1943, the last button tapping telephone had been phased out. Rotary dials worked by generating pulses in a certain frequency range based on where the rotary dial turned. Candlestick Phones

Candlestick phones were popularized throughout the 1890s to the 1930s. k electric share price The candlestick phone was separated into two pieces: a mouthpiece that stood upright (“the candlestick”) and a receiver, which was placed in your ear when you were placing a phone call. By the 1930s, these types of phones had phased out of fashion as phone manufacturers started combining the mouth piece and receive into a single unit – a trend that continues to the modern day. Touch Tone Phones

The first telephone book was released soon after the world’s first telephone line was invented. That first telephone book, released in 1878 by the New Haven District Telephone Company, was just one page long and held 50 names. save electricity images The book did not list any numbers. If you needed to call someone, you just said that person’s name and the operator would connect you.