Also, Armstrong discovered that Lee De Forest's Audion would go into oscillation when feedback was increased.

While De Forest's addition of a third element to the Audion ( the grid ) and the subsequent move to modulated ( voice ) radio is not disputed, De Forest did not put his device to work.

Lee De Forest's 1906 " audion " was also developed as a radio detector, and soon led to the development of the triode tube.

De Forest's device was not a hard vacuum tube, as he erroneously believed that it depended on the presence of residual gas remaining after evacuation.

In De Forest's system, the sound track was photographically recorded on to the side of the strip of motion picture film to create a composite, or " married ", print.

As with Lauste and Tigerstedt, Tykociner's system would never be taken advantage of commercially ; De Forest's, however, soon would.

The following year, De Forest's studio released the first commercial dramatic film shot as a talking picture — the two-reeler Love's Old Sweet Song, directed by J. Searle Dawley and featuring Una Merkel.

" De Forest's process continued to be used through 1927 in the United States for dozens of short Phonofilms ; in the UK it was employed a few years longer for both shorts and features by British Sound Film Productions, a subsidiary of British Talking Pictures, which purchased the primary Phonofilm assets.

Unlike Fox-Case's Movietone and De Forest's Phonofilm, which were variable-density systems, Photophone was a variable-area system — a refinement in the way the audio signal was inscribed on film that would ultimately become the rule.

From 1921 to 1924, Case provided Lee De Forest with inventions of the Case Research Lab for use as improvements in De Forest's Phonofilm system, but had a falling-out with De Forest after failing to be credited for those inventions, such as the AEO Light, that made De Forest's system workable.

From May 1924 to September 1926, the studio used Dr. Lee De Forest's Phonofilm sound-on-film process to produce 19 early cartoons with synchronized sound tracks, including Come Take a Trip in My Airship, Darling Nelly Gray, Has Anybody Here Seen Kelly and By the Light of the Silvery Moon.

DeVry University was originally named DeForest Training School by its founder Dr. Herman A. DeVry, who was a friend and colleague of De Forest's.

However, De Forest's Audion is quite distinct from the true vacuum triode in that it is not capable of linear amplification.

The repeating amplifiers were trouble for several years beyond the advent of De Forest's Audion tube.

The problem was that ( possibly to distance his invention from the Fleming valve ) De Forest's original patents specified that low-pressure gas inside the Audion was essential to its operation ( Audion being a contraction of " Audio-Ion "), and in fact early Audions had severe reliability problems due to this gas being absorbed by the metal electrodes.

One of the major weakness of De Forest's claims is that true vacuum triodes simply will not work if there is any trace of gas left in the envelope.

This distinction started around 1906 with the invention by Lee De Forest of the triode, which made electrical amplification of weak radio signals and audio signals possible with a non-mechanical device.

The first three-element device ( mercury-vapor filled with a control grid ) was patented on March 4 1906 by the Austrian Robert von Lieben independent from that, on October 25 1906 Lee De Forest patented his two-element Audion.

The flywheel as a general mechanical device for equalizing the speed of rotation is, according to the American medievalist Lynn White, recorded in the De diversibus artibus ( On various arts ) of the German artisan Theophilus Presbyter ( ca.

An Audion is a wireless signal detector device invented by Lee De Forest in 1906.

De Forest found that gas in a partial vacuum heated by a conventional lamp filament behaved much the same way, and that if a wire were wrapped around the glass housing, the device could serve as a detector of radio signals.

As well as De Forest himself, numerous researchers had tried to find ways to improve the reliability of the device by stabilizing the partial vacuum.

The Dominical Letter does not seem to have been familiar to Bede in his " De temporum ratione ", but in its place he adopts a similar device of seven numbers which he calls concurrentes ( De Temp.

In 1906 Lee De Forest added a third electrode and invented the first electronic amplifying device, the triode, which he named the Audion.

In the movie The Score Nick Wells ( played by Robert De Niro ) uses a thermal lance to cut a hole in the top of a safe, to avoid the safe's glass relocker device.

The method of loci ( plural of Latin locus for place or location ), also called the memory palace, is a mnemonic device introduced in ancient Roman rhetorical treatises ( in the anonymous Rhetorica ad Herennium, Cicero's De Oratore, and Quintilian's Institutio oratoria ).

At the moment he was excited about his son's having received the Prix De Rome in archaeology and was looking forward to being present this summer at the excavation of an Etruscan tomb.

In New York he was well received by what was then only a small brave band of non-figurative artists, including Alexander Calder, George K. L. Morris, De Kooning, Holty and a few others.

The result was the `` Gross Report '', prepared by Gross, as chairman, with the assistance of two U.N. Under Secretaries, Constantin Stavropoulos and Philippe De Seynes.

Though Catherine was vexed at the number of French officers streaming to the Turkish standard, there were several under her own, such as the Prince De Nassau ; ;

Boniface was later to explain to the English that Robert of Burgundy and Guy De St.-Pol were easy enough to do business with ; ;

Of Mark Antony De Wolfe Howe the philosopher Whitehead said the Earth's first visitors to Mars should be persons likely to make a good impression, and when he was asked, `` Whom would you send ''??

Monsieur De Cury was incensed, of course.

Alex's instruction was rapid, for the doctor had to go off to the Rue Ecole De Medecine to hear more speeches with only time for one sip of wine to sustain him through them all.

Ballet flowered in Italy during the next hundred years, and about 1550 was carried to France when the Italian princess, Catherine De Medicis, married the King of France.

The most famous ballet of that time was called Ballet Comique De La Reine ( 1581 ).

Oersted remodeled Ritter's notes into an essay in French which was submitted to the Institut De France for its annual prize of 3,000 francs.

A Bureau De La Demographie ( A. Romaniuk, Director ) was formed under AIMO in the Congo, to work in close rapport with the Section Statistique of the Secretariat General.

A member of the IRSAC staff ( E. Van De Walle ) was recently delegated to cooperate with AIMO in the development of demographic statistics in this territory.

Brevet Major General George Armstrong Custer was the regiment's first permanent commander and, like such generals as George S. Patton and Terry De La Mesa Allen in their rise to military prominence, Custer was a believer in blood and guts warfare.

De La Laude, commander of the Alabama post, had the friendship of the natives, and was able to make them look upon the British as poor competitors.

Diario De La Marina was the oldest and most influential paper in Cuba, with a reputation for speaking out against tyranny.

A year ago it was bruited that the primary character in Erich Maria Remarque's new novel was based on the Marquis Alfonso De Portago, the Spanish nobleman who died driving in the Mille Miglia automobile race of 1957.

the twelfth Marquis De Portago was intelligent, purposeful, and passionate.

The working principle of a yupana is unknown, but in 2001 an explanation of the mathematical basis of these instruments was proposed by Italian mathematician Nicolino De Pasquale.

It was won by Georges Bouton of the De Dion-Bouton Company, in a car he had constructed with Albert, the Comte de Dion, but as he was the only competitor to show up it is rather difficult to call it a race.