This troublesome device was superseded by thermionic diodes by the 1920s, but after high purity semiconductor materials became available, the crystal detector returned to dominant use with the advent of inexpensive fixed-germanium diodes in the 1950s.

After electronic disc-playing machines started appearing on the market during the second half of the 1920s, usually sharing the same cabinet with a radio receiver, the term " record player " was increasingly favored by users when referring to the device.

Since the production of high-quality semiconductor materials was still decades away, Lilienfeld's solid-state amplifier ideas would not have found practical use in the 1920s and 1930s, even if such a device were built.

* 1920s – Yasujiro Niwa invented a device for phototelegraphic transmission through cable and later via radio.

" The Soviet device used a magnetic field to confine the secondary electrons and relied on the Ag-O-Cs photocathode which had been demonstrated by General Electric in the 1920s.

The device was first developed in the late 1920s, and saw use starting in the 1930s, chiefly being used for land-line press services.

In the 1920s, he invented a simple device for phototelegraphic transmission through cable and later via radio, a precursor to mechanical television.

In the 1920s, he developed the Link Trainer, " a fuselage-like device with a cockpit and controls that produced the motions and sensations of flying.

In the history of cryptography, the Kryha machine was a device for encryption and decryption, appearing in the early 1920s and used until the 1950s.

In the 1920s, the Japanese electrical scientist Yasujiro Niwa invented a simple device for phototelegraphic transmission through cable and later via radio.

A woggle is a device to fasten the neckerchief, or scarf, worn as part of the Scout or Girl Guides uniform, originated by a Tasmanian Scout in the 1920s.

In light of a radio often being the first electrical device in a home not connected centrally generated electric power, it is not surprising that both the Cleveland-based Willard Storage Batteries Company and a local outlet for Willard Batteries should found and own stations in the early 1920s, as with WTAM in Cleveland ( 9 months ' ownership ) and KJBS ( apparently for several decades ).

Inspired by the time Gershwin had spent in Paris, it evokes the sights and energy of the French capital in the 1920s.

What they and many others of that generation in the Nordic countries had in common was that they started off from a classical education and were first designing in the so-called Nordic Classicism style – a style that had been a reaction to the previous dominant style of National Romanticism – before moving, in the late 1920s, towards Modernism.

By the 1920s, each state in the United States had passed public laws that stipulated a certain day to be Arbor Day or Arbor and Bird Day observance.

By the late 1920s Potter and her Hill Top farm manager Tom Storey had made a name for their prize-winning Herdwick flock.

George V had substantial improvements done during the 1910s and 1920s, including formal gardens to the south of the castle.

By the 1920s, many newspapers had a comics page on which many strips were collected together.

Werner Heisenberg had been an assistant to Niels Bohr at his institute in Copenhagen during part of the 1920s, when they helped originate quantum mechanical theory.

The couple adopted Katherine Lester in the early 1920s ; her father had been killed in World War I and her mother had died of tuberculosis.

Because of the switch to Portland cement, by the end of the 1920s of the 15 Rosendale cement companies, only one had survived.

Sagan traced his later analytical urges to his mother, a woman who had known " extreme poverty as a child ", and had grown up almost homeless in New York City during World War I and the 1920s.

Many top nationalist generals, including Chiang, had studied and trained in Japan before the Nationalists had returned to the mainland in the 1920s, and maintained close personal friendships with top Japanese officers.

Thomas had extended stays here in the 1920s with his aunt Annie and her husband, Jim Jones.

Apparently Husserl and Heidegger had moved apart during the 1920s, which became clearer after 1928 when Husserl retired and Heidegger succeeded to his University chair.

Although he had a reckless, unpredictable, and violent nature that precluded him from attaining any court or government responsibility and led to the ruination of his estate, Oxford was noted in his own time as a patron of the arts, lyric poet, and playwright, and since the 1920s he has been the most popular alternative candidate proposed for the authorship of Shakespeare's works.

As well, the Soviet Union's influence in Europe had increased throughout the 1920s and early 1930s.

Before the inception of the World Cup, the Olympics ( especially during the 1920s ) had the same status as the World Cup.

It had a " golden age " in the United Kingdom in the early 1920s when crowds reached 50, 000 at some matches ; this was stopped on 5 December 1921 when England's Football Association voted to ban the game from grounds used by its member clubs.

In the 1920s, the Italian Fascist government's Opera Nazionale Dopolavoro ( OND ) allowed working women to attend various entertainment and recreation events, including sports that in the past had traditionally been played by men.

The restaurant had been open since the 1970s and prior to that the building had been Fraser's Cafe since the 1920s.

Although air transport in Guyana had its beginnings in the 1920s when the first " bush " services were introduced, Government's earnest participation can be dated from 1947 when a Director of Civil Aviation was appointed to regulate the industry.

The editor of a collection of over 3, 000 vintage Halloween postcards writes, " There are cards which mention the custom trick-or-treating or show children in costumes at the doors, but as far as we can tell they were printed later than the 1920s and more than likely even the 1930s.

The editor of a collection of over 3, 000 vintage Halloween postcards writes, " There are cards which mention the custom trick-or-treating or show children in costumes at the doors, but as far as we can tell they were printed later than the 1920s and more than likely even the 1930s.

9 Issue 3, pp 348 – 366 ; work done in 1920s and 1930s in JSTOR

During the 1920s, it is estimated that an average of 3. 2 million visitors frequented the Pier annually.

His new process made possible using gases such as ammonia, sulfur dioxide ( SO2 ) and methyl chloride ( CH < sub > 3 </ sub > Cl ) as refrigerants and they were widely used for that purpose until the late 1920s.

They were a popular form of transport for many years, peaking at more than 3, 000 in the 1920s.

* List of people on the cover of Time Magazine: 1920s − 3 May 1926

In the late 1920s, air conditioning and refrigeration systems employed compounds such as ammonia ( NH < sub > 3 </ sub >), chloromethane ( CH < sub > 3 </ sub > Cl ), propane, and sulfur dioxide ( SO < sub > 2 </ sub >) as refrigerants.

In 1918, construction on Illinois Route 3 was begun as a state financed highway from Cairo to Rock Island through Macomb ; in the late 1920s U. S. Route 67 was extended along this route to Dubuque, Iowa.

With the advent of the automobile, the city was initially located on State Highway 3 starting in the early 1920s, which was redesignated as U. S. Route 66 in 1926 and paved entirely across Western Oklahoma by 1932.

The discovery of oil caused a boom in the 1920s, and the population was 3, 311 in 1930.

After concrete and cinderblock, concrete block is the third most common foundation material ( almost 3 percent ); it was also employed for garages, outbuildings and additions in the 1920s and 1930s.

At the peak of the oil boom in the late 1920s, White Deer was home to nearly 3, 000 people.

The collection includes: over 3, 000 textile items from the 1920s through the 1990s, including film and stage costumes as well as over a thousand items from Dietrich's personal wardrobe ; 15, 000 photographs, by Cecil Beaton, Horst P. Horst, George Hurrell, Lord Snowdon and Edward Steichen ; 300, 000 pages of documents, including correspondence with Burt Bacharach, Yul Brynner, Maurice Chevalier, Noël Coward, Jean Gabin, Ernest Hemingway, Karl Lagerfeld, Nancy and Ronald Reagan, Erich Maria Remarque, Josef von Sternberg, Orson Welles, and Billy Wilder ; as well as other items like film posters and sound recordings.

By the end of the 1920s, AC produced a 2 liter six, the 3. 5 liter Nazzaro had a three-valve OHC ( only until 1922 ), while French makers Amilcar, Bignan, Hispano-Suiza, and Samson had the typical small four-cylinder sporters and Delage, Hotchkiss, and Chenard-Walcker the large tourers.

In the early 1920s, Miller built his own 3. 0 litre ( 183 in³ ) engine, inspired by the Peugeot Grand Prix engine which had been serviced in his shop by Fred Offenhauser in 1914, installing it in Jimmy Murphy's Duesenberg and allowing him to win the 1922 edition of the race.

Luís Carlos Prestes ( January 3, 1898 – March 7, 1990 ) was a leader of the 1920s tenente rebellion and the Communist opposition to the dictatorship of Getúlio Vargas in Brazil.

Lil Hardin Armstrong ( February 3, 1898 – August 27, 1971 ) was a jazz pianist, composer, arranger, singer, and bandleader, and the second wife of Louis Armstrong with whom she collaborated on many recordings in the 1920s.

Athos C. ( Ace ) Brigode ( January 5, 1893 – February 3, 1960 ) was a United States dance band leader who enjoyed his greatest popularity in the 1920s.

Margaret Young ( born Margaret Youngblood February 23, 1891 in Detroit, Michigan-died May 3, 1969 in Inglewood, California ) was a popular singer and comedienne in the United States in the 1920s.

In the late 1920s the population of the island had dropped to 3, 000, while about 8, 000 inhabitants lived abroad, predominantly in Australia, Egypt, Greece and the U. S. At that time the town had 730 inhabited houses, while 675 were already empty, and many ruined.

Throughout the 1920s, only between 2. 3 % and 3. 4 % of the total population could vote.