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Francis Joseph McCarty
Francis Joseph McCarty (May 23, 1888 – May 11, 1906) was a San Francisco experimenter, who conducted early radiotelephone research and development. He died at the age of 17, but despite his young age and early death, in 2011 he was elected into the Bay Area Radio Hall of Fame, recognized as being one of the "pioneers of broadcasting in the Bay Area". Biography Francis Joseph McCarty was born in San Francisco, California in 1888 to John Henry McCarty and Catherine Lynch. His sister, Mary Eunice McCarthy (who used a different spelling of the family name), reported in a memoir that at the age of thirteen Francis received permission to drop out of school, having found most of the curriculum a distraction to his desire to become an inventor. With the assistance of one of the Jesuit professors at the local St. Ignatius College Preparatory, St. Ignatius school that he had been attending, McCarty developed his own routine of independent study. At this time radio transmissions (then com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John P
John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second Epistle of John, often shortened to 2 John * Third Epistle of John, often shortened to 3 John People * John the Baptist (died ), regarded as a prophet and the forerunner of Jesus Christ * John the Apostle (died ), one of the twelve apostles of Jesus Christ * John the Evangelist, assigned author of the Fourth Gospel, once identified with the Apostle * John of Patmos, also known as John the Divine or John the Revelator, the author of the Book of Revelation, once identified with the Apostle * John the Presbyter, a figure either identified with or distinguished from the Apostle, the Evangelist and John of Patmos Other people with the given name Religious figures * John, father of Andrew the Apostle and Saint Peter * Pope John (disambigu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mary Eunice McCarthy
Mary Eunice McCarthy (March 4, 1899 – August 7, 1969) was an American screenwriter, playwright, journalist and author, perhaps best known today as the screenwriter of, and driving force behind, the biopic '' Sister Kenny'' (1946).Cohn, Victor (February 10, 1954). "The Story of Sister Kenny: Seven Questions at Party Tested Nurse's Character". pp. 1-A10-A Retrieved February 2, 2022. . Biography Beginnings One of 13 children born to John Henry McCarty and Catherine Elizabeth Theresa Lynch,Nichols, Luther (November 8, 1957)[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morse Code
Morse code is a telecommunications method which Character encoding, encodes Written language, text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy. International Morse code encodes the 26 ISO basic Latin alphabet, basic Latin letters to , one Diacritic, accented Latin letter (), the Arabic numerals, and a small set of punctuation and procedural signals (Prosigns for Morse code, prosigns). There is no distinction between upper and lower case letters. Each Morse code symbol is formed by a sequence of ''dits'' and ''dahs''. The ''dit'' duration can vary for signal clarity and operator skill, but for any one message, once the rhythm is established, a beat (music), half-beat is the basic unit of time measurement in Morse code. The duration of a ''dah'' is three times the duration ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cliff House, San Francisco
The Cliff House is a neo-classical style building perched on the headland above the cliffs just north of Ocean Beach. Located on the West Side of San Francisco in the city's Outer Richmond neighborhood, the building overlooks the site of the Sutro Baths ruins, Seal Rocks, and is part of the Golden Gate National Recreation Area and operated by the National Park Service (NPS). The Cliff House is owned by the NPS; the building's terrace hosts a room-sized camera obscura. For most of the Cliff House's history, since 1863, the building's main draw has been restaurants and bars where patrons could enjoy the Pacific Ocean views. Since 1977, these restaurants and bars have been run by a private operator under contract with the National Park Service. In December 2020, the 47-year operator of these amenities announced that it was closing, and it criticized the NPS for not having signed a new long-term lease with any operator since its own prior 20-year lease had expired in June 2018. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1906 San Francisco Earthquake
At 05:12 AM Pacific Time Zone, Pacific Standard Time on Wednesday, April 18, 1906, the coast of Northern California was struck by a major earthquake with an estimated Moment magnitude scale, moment magnitude of 7.9 and a maximum Mercalli intensity scale, Mercalli intensity of XI (''Extreme''). High-intensity shaking was felt from Eureka, California, Eureka on the North Coast (California), North Coast to the Salinas Valley, an agricultural region to the south of the San Francisco Bay Area. Devastating fires soon broke out in San Francisco and lasted for several days. More than 3,000 people died and over 80% of the city was destroyed. The event is remembered as the List of disasters in the United States by death toll, deadliest earthquake in the history of the United States. The death toll remains the greatest loss of life from a natural disaster in California's history and high on the list of worst American disasters. Tectonic setting The San Andreas Fault is a continental tran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyril Frank Elwell
Cyril Frank Elwell (August 20, 1884 – February 11, 1963) was an Australian-bornHugh G.J. Aitken, ''The Continuous Wave: Technology and American Radio, 1900-1932'' Princeton University Press, 2014, Chapter 3 ''Elwell, Fuller and the Arc'' American inventor and pioneer in development of radio. He had an American father and a German mother, then went to Fort St. Model Public School in Sydney, Australia. Elwell arrived in the United States in 1902. He applied to Stanford University and entered the electrical engineering program there. In 1906, he organized fellow students to participate in repairs at the campus, owing to the San Francisco earthquake. He graduated in 1907. He founded the Poulsen Wireless Telephone and Telegraph Company, later renamed Federal Telegraph Company in 1909. Elwell designed a large transformer for electric arc furnace reduction of iron ore; this became the topic of his thesis. He had published some technical papers on applications in electric metallurg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valdemar Poulsen
Valdemar Poulsen (23 November 1869 – 23 July 1942) was a Danish engineer who developed a magnetic wire recorder called the telegraphone in 1898. He also made significant contributions to early radio technology, including the first continuous wave radio transmitter, the Poulsen arc, which was used for a majority of the earliest audio radio transmissions, before being supplanted by the development of vacuum-tube transmitters. Early life Poulsen was born on 23 November 1869 in Copenhagen. He was the son of the Supreme Court judge ''Denmark and the Danes'' by William J. Harvey and Christian Reppien, 1915, pages 233-239. Jonas Nicolai Johannes Poulsen and Rebekka Magdalene ( Bra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arc Converter
The arc converter, sometimes called the arc transmitter, or Poulsen arc after Danish engineer Valdemar Poulsen who invented it in 1903, was a variety of spark transmitter used in early wireless telegraphy. The arc converter used an electric arc to convert direct current electricity into radio frequency alternating current. It was used as a radio transmitter from 1903 until the 1920s when it was replaced by vacuum tube transmitters. One of the first transmitters that could generate continuous sinusoidal waves, it was one of the first technologies used to transmit sound (amplitude modulation) by radio. It is on the list of IEEE Milestones as a historic achievement in electrical engineering. History Elihu Thomson discovered that a carbon arc shunted with a series tuned circuit would "sing". This "singing arc" was probably limited to audio frequencies. Bureau of Standards credits William Duddell with the shunt resonant circuit around 1900. The English engineer William Duddell di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Federal Telegraph Company
The Federal Telegraph Company was a United States manufacturing and communications company that played a pivotal role in the 20th century in the development of radio communications. History The company was founded in Palo Alto, California in 1909 by Cyril Frank Elwell, and was first known as the Poulsen Wireless Company, after licensing Valdemar Poulsen's arc transmitter for use in the United States. The company initially developed high-powered transmitters used for long distance radiotelegraph communication. In 1911–13, Lee De Forest and two assistants worked at Federal Telegraph on the first vacuum tube amplifier and oscillator, which De Forest called the "Oscillaton" after his earlier Audion. After the U.S. entry into World War I in April 1917, the government took control of the radio industry. The United States Navy then purchased nearly all of the U.S. commercial radio stations, including, effective May 15, 1918, Federal Telegraph's for $1.6 million. (Company president ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1888 Births
Events January * January 3 – The great telescope (with an objective lens of diameter) at Lick Observatory in California is first used. * January 12 – The Schoolhouse Blizzard hits Dakota Territory and the states of Montana, Minnesota, Nebraska, Kansas and Texas, leaving 235 dead, many of them children on their way home from school. * January 13 – The National Geographic Society is founded in Washington, D.C. * January 19 – The Battle of the Grapevine Creek, the last major conflict of the Hatfield–McCoy feud in the Southeastern United States. * January 21 – The Amateur Athletic Union is founded by William Buckingham Curtis in the United States. * January 26 – The Lawn Tennis Association is founded in England. February * February 27 – In West Orange, New Jersey, Thomas Edison meets with Eadweard Muybridge, who proposes a scheme for sound film. March * March 8 – The Agriculture College of Utah (later Utah State University) i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1906 Deaths
Events January–February * January 12 – Persian Constitutional Revolution: A nationalistic coalition of merchants, religious leaders and intellectuals in Persia forces the shah Mozaffar ad-Din Shah Qajar to grant a constitution, and establish a national assembly, the National Consultative Assembly, Majlis. * January 16–April 7 – The Algeciras Conference convenes, to resolve the First Moroccan Crisis between French Third Republic, France and German Empire, Germany. * January 22 – The strikes a reef off Vancouver Island, Canada, killing over 100 (officially 136) in the ensuing disaster. * January 31 – The 1906 Ecuador–Colombia earthquake, Ecuador–Colombia earthquake (8.8 on the Moment magnitude scale), and associated tsunami, cause at least 500 deaths. * February 7 – is launched, sparking a Anglo-German naval arms race, naval race between Britain and Germany. * February 11 ** Pope Pius X publishes the encyclical ''Vehementer Nos'', de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
