He invented the regenerative circuit while he was an undergraduate and patented it in 1914, followed by the super-regenerative circuit in 1922, and the superheterodyne receiver in 1918.

In 1877 – 78, Edison invented and developed the carbon microphone used in all telephones along with the Bell receiver until the 1980s.

The most important and widely used application of the heterodyne technique is in the superheterodyne receiver ( superhet ), invented by U. S. engineer Edwin Howard Armstrong in 1918.

An intermediate frequency was first used in the superheterodyne radio receiver, invented by American scientist Major Edwin Armstrong in 1918, during World War I.

: The most important and widely used application of the heterodyne technique is in the superheterodyne receiver ( superhet ), invented by U. S. engineer Edwin Howard Armstrong in 1918.

In 1981, Rabin reinvented a weak variant of the technique of oblivious transfer invented by Wiesner under the name of multiplexing, allowing a sender to transmit a message to a receiver where the receiver has some probability between 0 and 1 of learning the message, with the sender being unaware whether the receiver was able to do so.

The regenerative receiver was invented and patented in 1914 by American electrical engineer Edwin Armstrong when he was an undergraduate at Columbia University.

The Tellurometer was invented by Dr. Trevor Lloyd Wadley of the Telecommunications Research Laboratory of the South African Council for Scientific and Industrial Research ( CSIR ), also responsible for the Wadley Loop receiver, which allowed precision tuning over wide bands, a task that had previously required switching out multiple crystals.

It was replaced by the Superheterodyne receiver invented by Edwin Armstrong.

When Edwin Armstrong invented the superheterodyne receiver in 1918, although the tetrode had been invented a couple of years earlier, he nevertheless employed only triodes in his design.

While a student at Ohio Wesleyan, he had made a " talking telegraph " and invented a receiver containing two features of the modern telephone: a permanent magnet and a metallic diaphragm that he made of a tintype.

He invented the first telephone receiver with a permanent magnet in 1865, 11 years before Alexander Graham Bell patented his model.

He also independently invented a semiconductor rectifier diode, which he used to invent the crystal radio detector for the world's first radio transmitter and receiver.

It was also here that he invented the Wadley Loop receiver, which allowed precision tuning over wide bands, a task that had previously required switching out multiple crystals.

Winchester had the basic design of the Henry rifle completely modified and improved to become the first Winchester rifle, the Model 1866, which fired the same. 44 caliber rimfire cartridges as the Henry but had an improved magazine ( with the addition of a loading gate on the right side of the receiver, invented by Winchester employee Nelson King ) and, for the first time, a wooden forearm.

As stated by Timothy Barnes, Athanasius used “ invented dialogue to ridicule his adversaries ”, and used “ suppression and distortion ” to serve his own means.

The dandy horse, also called Draisienne or laufmaschine, was the first human means of transport to use only two wheels in tandem and was invented by the German Baron Karl von Drais.

File: Johannes Kepler 1610. jpg | Johannes Kepler ( 1571 — 1630 ): used the accurate observations of Tycho Brahe to formulate three fundamental laws of planetary motion, described elliptical motion of planets around the sun, developed early telescopes, invented the convex eyepiece, discovered a means of determining the magnifying power of lenses.

King Henry V of England is credited with having invented what some consider the first true passport, notwithstanding the earlier examples cited, as a means of helping his subjects prove who they were in foreign lands.

As writer Michael Bracewell notes in his book Roxy: the band that invented an era, Roxy Music was created expressly by Ferry, Mackay and Eno as a means of combining their mutual interests in music, modern art and fashion.

This tradition may have been invented by the comic poets as a witticism, as the name of the purported husband means " Penis, from Men's Island.

( Lehrer has stated that he invented the Jell-O Shot during this time, as a means of circumventing liquor restrictions.

Various systems have been invented to allow authors to provide a means for readers to reliably authenticate that a given message originated from or was relayed by them.

Although the Elvish languages Sindarin and Quenya are the most famous and the most developed of the languages that Tolkien invented for his Secondary World, they are by no means the only ones.

Eärendil means ' Lover of the Sea ' in Tolkien's invented language of Quenya.

For many years, it had been one of his favourite schemes to secure, by means of simultaneous observations at distant points, a thorough investigation of the nature and law of " magnetic storms " ( a term invented by him to designate abnormal disturbances of Earth's magnetism ).

Maugham ’ s suggestion that he " invented nothing " was a source of annoyance for Christopher Isherwood, who helped him translate a verse 1. 3. 14 from the Katha Upanishads for the novel ’ s epigraph-उत ् त ि ष ् ठ ज ा ग ् रत प ् र ा प ् य वर ा न ् न ि ब ो धत | क ् ष ु रस ् य ध ा र ा न ि श ि त ा द ु रत ् यय ा द ु र ् ग ं पथस ् तत ् कवय ो वदन ् त ि || ( uttiShTha jAgrata prApya varAn_nibodhata | kShurasya dhArA nihitA duratyayA pathas_tat_-avayo vadanti || )-which means " Rise, awaken, seek the wise and realize.

Old Irish cumal means " female slave ", and it is possible that a noble father was invented for Fionn to obscure an ignoble origin.

However, heterodyne reception was not fully practical for a decade after it was invented, since it required a means for producing a stable local signal, which awaited the development of the oscillating vacuum-tube.

They invented a new organization called the Cordova Community Council as a means for all of these civic institutions to come together to share information and work on community projects.

Shklovsky invented the term as a means to “ distinguish poetic from practical language on the basis of the former ’ s perceptibility ” ( Crawford 209 ).

His name is derived from Anar, which means " Sun " in Tolkien's invented language of Quenya.

In a 1977 interview for BBC Wales, Vicious claimed to have invented the Pogo as a means to knock them over at the 100 Club.

The Elvish form Nírnaeth Arnoediad ( pronounced ; in this case the digraph oe denotes a rounded variant of the sound, more or less like German ' ö ') comes from Sindarin, one of the languages invented by Tolkien, and translates to Tears Uncountable: nîn means ' tear ( s )', in compound nírnaeth ' tears of woe '; prefix ar-bears the sense of ' beyond ' and the root nod-means ' count ', with o umlauted to œ by the following i. J. R. R. Tolkien often omitted the accent over the first vowel ( due to haste or neglect ), and this spelling was introduced into the published Silmarillion by Christopher Tolkien ; in editorial text within later writings, as The War of the Jewels, he used the accented form.

As an offset to this sword maker, the Royalists had among their adherents Colonel Dud Dudley, who had invented a means of smelting iron by the use of coke, and who claimed he could turn out " all sorts of bar iron fit for making of muskets, carbines, and iron for great bolts ", both more cheaply, more speedily and more excellent than could be done in any other way.

There he hired his long-term research partner, John Warnock and together they invented a page description language ( PDL ), which provided a means to describe complex forms like typefaces electronically – called Interpress.

To prevent Truman from discovering his false reality, Christof has invented means of dissuading his sense of exploration, including " killing " his father in a storm while on a fishing trip to instill in him a fear of the water, and making many news reports and ' adverts ' about the dangers of travelling, and featuring television shows about how good it is to stay at home.

Domestically, TNR as of 2011 supports a largely modern liberal stance on fiscal and social issues, according to editor Franklin Foer, who stated that it " invented the modern usage of the term ' liberal ', and it's one of our historical legacies and obligations to be involved in the ongoing debate over what exactly liberalism means and stands for.

He invented and promoted the use of an isolation tank as a means of sensory deprivation.

FM radio was invented by Edwin H. Armstrong in the 1930s for the specific purpose of overcoming the interference problem of AM radio, to which it is relatively immune.

In 1800, as the result of a professional disagreement over the galvanic response advocated by Galvani, he invented the voltaic pile, an early electric battery, which produced a steady electric current.

The bow seems to have been invented in the later Paleolithic or early Mesolithic periods.

The encoding of data by discrete bits was used in the punched cards invented by Basile Bouchon and Jean-Baptiste Falcon ( 1732 ), developed by Joseph Marie Jacquard ( 1804 ), and later adopted by Semen Korsakov, Charles Babbage, Hermann Hollerith, and early computer manufacturers like IBM.

French Beaded Flowers were being made as early as the 16th century, and lampwork glass was invented in the 18th century.

Stroustrup began developing C ++ in 1979 ( then called " C with Classes "), and, in his own words, " invented C ++, wrote its early definitions, and produced its first implementation ... chose and formulated the design criteria for C ++, designed all its major facilities, and was responsible for the processing of extension proposals in the C ++ standards committee.

Beatmatching was invented by Francis Grasso in the late 1960s and early 1970s.

During the early twentieth century, electro-mechanical machines were invented to do encryption and decryption using transposition, polyalphabetic substitution, and a kind of " additive " substitution.

Skeat “… in at least three cases and probably in all, in the form of codices " and he theorized that this form of notebook was invented in Rome and then “… must have spread rapidly to the Near East …” In his discussion of one of the earliest pagan parchment codices to survive from Oxyrhynchus in Egypt, Eric Turner seems to challenge Skeat ’ s notion when stating “… its mere existence is evidence that this book form had a prehistory ” and that “ early experiments with this book form may well have taken place outside of Egypt .” Early codices of parchment or papyrus appear to have been widely used as personal notebooks, for instance in recording copies of letters sent ( Cicero Fam.

One of the early attempts was an electro-mechanical Chinese typewriter Ming kwai () which was invented by Lin Yutang, a prominent Chinese writer.

In the early 19th century these two instrument makers almost simultaneously invented the valves still used today.

The clavichord was invented in the early fourteenth century.

The early history of disc golf is closely tied to the history of the recreational flying disc ( especially as popularized by the trademarked Frisbee ) and may have been invented in the early 1900s.

Modern disc golf started in the early 1960s, when it seems to have been invented in many places and by many people independently.

ARPANET, the predecessor of the Internet, was introduced in the late 1960s, and ARPANET e-mail was invented in the early 1970s.

According to old German literature, dragoons were invented by Count Ernst von Mansfeld, one of the greatest German military commanders, in the early 1620s.

NASA planners invented the term extra-vehicular activity in the early 1960s for the Apollo program to land men on the Moon, because the astronauts would leave the spacecraft to collect lunar material samples and deploy scientific experiments.

Though early thermal weapons, such as Greek fire, have existed since ancient times, the first widely used explosive in warfare and mining was black powder, invented in 9th century China ( see the history of gunpowder ).

The game was invented in early 1970s in Gothenburg, Sweden.

He also invented the backscatter photometer ozone-monitoring instrument for early versions of weather satellites.

Clokey and his wife, Ruth ( née Parkander ), invented Gumby in the early 1950s at their Covina home shortly after Art finished film school at USC.

According to Popular Mechanics, " The common sponge was used in ancient Greece as a gas mask ..." An early type of rudimentary gas mask was invented in the 9th century by the Banu Musa brothers in Baghdad, Iraq.

Another early design was the " Safety Hood and Smoke Protector " invented by Garrett Morgan in 1912, and patented in 1914.

Some of his early novels, called " scientific romances ", invented a number of themes now classic in science fiction in such works as The Time Machine, The Island of Doctor Moreau, The Invisible Man, The War of the Worlds, When the Sleeper Wakes, and The First Men in the Moon.

In 1980, Tim Berners-Lee created ENQUIRE, an early hypertext database system somewhat like a wiki but without hypertext punctuation, which was not invented until 1987.