Wednesday, March 18, 2020
The Invention and Evolution of the Telephone
The Invention and Evolution of the Telephone In the 1870s, Elisha Gray and Alexander Graham Bell independently designed devices that could transmit speech electrically. Both men rushed their respective designs for these prototype telephones to the patent office within hours of each other. Bell patented his telephone first and later emerged the victor in a legal dispute with Gray. Today, Bells name is synonymous with the telephone, while Gray is largely forgotten. But the story of who invented the telephone goes beyond these two men.à Bells Biography Alexander Graham Bell was born on March 3, 1847, in Edinburgh, Scotland. He was immersed in the study of sound from the beginning. His father, uncle, and grandfather were authorities on elocution and speech therapy for the deaf. It was understood that Bell would follow in the family footsteps after finishing college. However, after Bells two other brothers died of tuberculosis, Bell and his parents decided to immigrate to Canada in 1870. After a brief period living in Ontario, the Bells moved to Boston, where they established speech-therapy practices specializing in teaching deaf children to speak. One of Alexander Graham Bells pupils was a young Helen Keller, who when they met was not only blind and deaf but also unable to speak. Although working with the deaf would remain Bells principal source of income, he continued to pursue his own studies of sound on the side. Bells unceasing scientific curiosity led to theà invention of the photophone, to significant commercial improvements in Thomas Edisons phonograph, and to development of his own flying machine just six years after the Wright Brothers launched their plane at Kitty Hawk. As President James Garfield lay dying of an assassins bullet in 1881, Bell hurriedly invented a metal detector in an unsuccessful attempt to locate the fatal slug. From Telegraph to Telephone The telegraph and telephone are both wire-based electrical systems, and Alexander Graham Bells success with the telephone came as a direct result of his attempts to improve the telegraph. When he began experimenting with electrical signals, the telegraph had been an established means of communication for some 30 years. Although a highly successful system, the telegraph was basically limited to receiving and sending one message at a time. Bells extensive knowledge of the nature of sound and his understanding of music enabled him to conjecture the possibility of transmitting multiple messages over the same wire at the same time. Although the idea of a multiple telegraph had been in existence for some time, no one had been able to fabricate one- until Bell. His harmonic telegraph was based on the principle that several notes could be sent simultaneously along the same wire if the notes or signals differed in pitch. Talk With Electricity By October 1874, Bells research had progressed to the extent that he could inform his future father-in-law, Boston attorney Gardiner Greene Hubbard, about the possibility of a multiple telegraph. Hubbard, who resented the absolute control then exerted by the Western Union Telegraph Company, instantly saw the potential for breaking such a monopoly and gave Bell the financial backing he needed. Bell proceeded with his work on the multiple telegraph, but he did not tell Hubbard that he and Thomas Watson, a young electrician whose services he had enlisted, were also developing a device that would transmit speech electrically. While Watson worked on the harmonic telegraph at the insistent urging of Hubbard and other backers, Bell secretly met in March 1875 with Joseph Henry, the respected director of the Smithsonian Institution, who listened to Bells ideas for a telephone and offered encouraging words. Spurred on by Henrys positive opinion, Bell and Watson continued their work. By June 1875 the goal of creating a device that would transmit speech electrically was about to be realized. They had proven that different tones would vary the strength of an electric current in a wire. To achieve success, they, therefore, needed only to build a working transmitter with a membrane capable of varying electronic currents and a receiver that would reproduce these variations in audible frequencies. Mr. Watson, Come Here On June 2, 1875, while experimenting with his harmonic telegraph, the men discovered that sound could be transmitted over a wire. It was a completely accidental discovery. Watson was trying to loosen a reed that had been wound around a transmitter when he plucked it by accident. The vibration produced by that gesture traveled along the wire into a second device in the other room where Bell was working. The twang Bell heard was all the inspiration that he and Watson needed to accelerate their work. They continued to work into the next year. Bell recounted the critical moment in his journal:à I then shouted into M [the mouthpiece] the following sentence: Mr. Watson, come here- I want to see you. To my delight, he came and declared that he had heard and understood what I said. The first telephone call had just been made. The Telephone Network Is Born Bell patented his device on March 7, 1876, and the device quickly began to spread. By 1877, construction of the first regular telephone line from Boston to Somerville, Massachusetts, had been completed. By the end of 1880, there were 47,900 telephones in the United States. The following year, telephone service between Boston and Providence,à Rhode Island, had been established. Service between New York and Chicago started in 1892, and between New York and Boston in 1894. Transcontinental service began in 1915.à Bell founded his Bell Telephone Company in 1877. As the industry rapidly expanded, Bell quickly bought out competitors. After a series of mergers, the American Telephone and Telegraph Co., the forerunner of todays ATT, was incorporated in 1880. Because Bell controlled the intellectual property and patents behind the telephone system, ATT had a de facto monopoly over the young industry. It would maintain its control over the U.S. telephone market until 1984, when a settlement with the U.S. Department of Justice forced ATT to end its control over state markets. Exchanges and Rotary Dialing The first regular telephone exchange was established in New Haven, Connecticut, in 1878. Early telephones were leased in pairs to subscribers. The subscriber was required to put up his own line to connect with another. In 1889, Kansas City undertaker Almon B. Strowger invented a switch that could connect one line to any of 100 lines by using relays and sliders. The Strowger switch, as it came to be known, was still in use in some telephone offices well over 100 years later. Strowgerà was issuedà a patent on March 11, 1891, for the first automatic telephone exchange. The first exchange using the Strowger switch was opened in La Porte, Indiana, in 1892. Initially, subscribers had a button on their telephone to produce the required number of pulses by tapping. An associate of Strowgers invented the rotary dial in 1896, replacing the button. In 1943, Philadelphia was the last major area to give up dual service (rotary and button). Pay Phones In 1889, the coin-operated telephone was patented by William Gray of Hartford, Connecticut. Grays pay phone was first installed and used in the Hartford Bank. Unlike pay phones today, users of Grays phone paid after they had finished their call. Pay phones proliferated along with the Bell System. By the time the first phone booths were installed in 1905, there were about 100,000 pay phones in the U.S. By the turn of the 21st century, there were more than 2 million pay phones in the nation. But with the advent of mobile technology, the public demand for pay phones rapidly declined, and today there are fewer than 300,000 still operating in the United States. Touch-Tone Phones Researchers at Western Electric, ATTs manufacturing subsidiary, had experimented with using tones rather than pulses to trigger telephone connections since the early 1940s. But it wasnt until 1963 that dual-tone multifrequencyà signaling, which uses the same frequency as speech, was commercially viable. ATT introduced it as Touch-Toneà dialing, and it quickly became the next standard in telephone technology. By 1990, push-button phones were more common than rotary-dial models in American homes. Cordless Phones In the 1970s, the very first cordless phones were introduced. In 1986, the Federal Communications Commission granted the frequency range of 47 to 49 MHz for cordless phones. Granting a greater frequency range allowed cordless phones to have less interference and need less power to run. In 1990, the FCC granted the frequency range of 900 MHz for cordless phones. In 1994, digital cordless phones, and in 1995, digital spread spectrum (DSS), were both respectively introduced. Both developments were intended to increase the security of cordless phones and decrease unwanted eavesdropping by enabling the phone conversation to be digitally spread out. In 1998, the FCC granted the frequency range of 2.4 GHz for cordless phones; today, the upward range is 5.8 GHz. Cell Phones The earliest mobile phones were radio-controlled units designed for vehicles. They were expensive and cumbersome, and had extremely limited range. First launched by ATT in 1946, the network would slowly expand and become more sophisticated, but it never was widely adopted. By 1980, it had been replaced by the first cellular networks. Research on what would become the cellular phone network used today began in 1947 at Bell Labs, the research wing of ATT. Although the radio frequencies needed were not yet commercially available, the concept of connecting phones wirelessly through a network of cells or transmitters was a viable one. Motorola introduced the first hand-held cellular phone in 1973. Telephone Books The first telephone book was published in New Haven, Connecticut, by the New Haven District Telephone Company in February 1878. It was one page long and held 50 names; no numbers were listed, as the operator would connect you. The page was divided into four sections: residential, professional, essential services, and miscellaneous. In 1886, Reuben H. Donnelly produced the first Yellow Pagesââ¬âbranded directory featuring business names and phone numbers, categorized by the types of products and services provided. By the 1980s, telephone books, whether issued by the Bell System or private publishers, were in nearly every home and business. But with the advent of the Internet and of cell phones, telephone books have been rendered largely obsolete.à 9-1-1 Prior to 1968, there was no dedicated phone number for reaching first responders in the event of an emergency. That changed after a congressional investigation led to calls for the establishment of such a system nationwide. The Federal Communications Commission and ATT soon announced they would launch their emergency network in Indiana, using the digits 9-1-1 (chosen for its simplicity and for being easy to remember). But a small independent phone company in rural Alabama decided to beat ATT at its own game. On Feb. 16, 1968, the first 9-1-1- call was placed in Hayleyville, Alabama, at the office of the Alabama Telephone Company. The 9-1-1 network would be introduced to other cities and town slowly; it wasnt until 1987 that at least half of all American homes had access to a 9-1-1 emergency network. Caller ID Several researchers created devices for identifying the number of incoming calls, including scientists in Brazil, Japan, and Greece, starting in the late 1960s. In the U.S., ATT first made its trademarked TouchStar caller ID service available in Orlando, Florida, in 1984. Over the next several years, the regional Bell Systems would introduce caller ID services in the Northeast and Southeast. Although the service was initially sold as a pricey added service, caller ID today is a standard function found on every cell phone and available on most any landlines. Additional Resources Want to know more about the history of the telephone? There are a number of great resources in print and online. Here are a few toà get you started: ââ¬â¹The History of the Telephone: This book, now in the public domain, was written in 1910. Its an enthusiastic narrative of the telephones history up to that point in time. Understanding the Telephone: A great technical primer on how analogà telephones (common in homes until the 1980s and 1990s) work.à Hello? A History of the Telephone: Slate magazine has a great slide show of phones from the past to the present. The History of Pagers: Before there were cell phones, there were pagers. The first one was patented in 1949. The History of Answering Machines: Voicemails precursor has been around almost as long as the telephone itself.
Monday, March 2, 2020
How to Avoid Sexist or Gendered Language
How to Avoid Sexist or Gendered Language How to Avoid Sexist or Gendered Language It was once, as James Brown sang, a manââ¬â¢s world. But things have changed. Women have fought against discrimination and taken their rightful place in politics, academia, business, and many other areas of life. But old attitudes live on in language. As such, we have to be careful about our word choice so that we donââ¬â¢t accidentally exclude or insult anyone based on sexist or gendered language. Here are some things to watch out for. Misogynistic Language It should hopefully go without saying, but some terms are inherently sexist. It would be unusual to use these in academic or formal writing, so we wonââ¬â¢t dwell on them for too long. But in case youââ¬â¢re not sure, referring to Boudica as ââ¬Å"some old hag who fought the Romansâ⬠will not win you high marks for a history essay. And not just because itââ¬â¢s too informal. Not a lady to mess with unless you like being run down in a chariot. Now weââ¬â¢ve got that out of the way, letââ¬â¢s look at some trickier cases of sexist and gendered language, including pronouns and generalizations. Gendered Pronouns and Words The most common problem we see, especially in academic writing, is use of gendered language. Pronouns are a great example, since the male pronouns ââ¬Å"heâ⬠and ââ¬Å"hisâ⬠were often used to refer to any non-specific person in the past. As such, you might find sentences like this in older books: How someone solves a problem may depend on his past experience. However, the author is not discussing an actual, specific man in this case. They are just referring to a person in general, so using ââ¬Å"hisâ⬠excludes anyone who doesnââ¬â¢t identify as a ââ¬Å"he.â⬠It would be better, then, to use ââ¬Å"his or her,â⬠the singular ââ¬Å"they,â⬠or plural terms: How people solve problems may depend on their past experiences. In this sentence, we avoid gendered language, making it more inclusive. Similar problems pop up with other terms, especially those that include the word ââ¬Å"man.â⬠Usually, these can be avoided by picking a different word. Instead of ââ¬Å"policeman,â⬠for example, you could say ââ¬Å"police officer.â⬠And instead of ââ¬Å"mankind,â⬠you could say ââ¬Å"humanity.â⬠This doesnââ¬â¢t work for every word, though! The term ââ¬Å"manhole,â⬠for example, is still widely used. You can call it a personhole if you like, but we dont recommend it. Subtly Sexist or Gendered Language Similar issues can arise with how we describe people of different genders. A classic example is the word ââ¬Å"bossy,â⬠which tends to be applied to women more than men (who are instead more usually described as ââ¬Å"assertiveâ⬠). It can be a good idea, then, to think about the descriptive terms we use when writing about people. Ask yourself, ââ¬Å"Would I use this word if the person was a different gender?â⬠This will help you catch subtly sexist or gendered language that you might not usually be conscious of using. Avoiding Generalizations As well as being careful about picking your words, take care not to make hasty generalizations based on sex or gender. These could be sweeping statements about a whole gender (e.g., ââ¬Å"All men are lazyâ⬠). But they can also be stated less clearly. For instance, we might say the following of someone: Despite being a man, Daniel is not lazy. In this case, the main clause ââ¬Å"Daniel is not lazyâ⬠is fine. But by framing it in terms of ââ¬Å"being a man,â⬠we imply that all (or most) men are lazy. Likewise, look out for positive stereotypes, such as: Rachel will be a good instructor because women are naturally nurturing. Here, the idea of women being ââ¬Å"nurturingâ⬠is presented as a positive. But the idea of women as ââ¬Å"maternalâ⬠or ââ¬Å"nurturingâ⬠may imply other negative stereotypes (e.g., that women canââ¬â¢t be tough or logical). As such, we should avoid such generalizations even if theyââ¬â¢re meant to be positive! It is much better in most cases to discuss people as individuals than representatives of a gender. And if you need any help coming up with alternatives to gendered language in your writing, it never hurts to have a professional proofreader check your documents.
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