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H. Lyman Saÿen
H. Lyman Saÿen (sometimes also spelled Sayen) was an American pioneer in the design of x-ray tubes who also distinguished himself as an abstract artist. Biography Early years Saÿen was born in Philadelphia on 25 April 1875 to Edward M. Saÿen and Annie T. Saÿen (née Thomas). Soon after graduating from Central Manual Training School in 1891, he went to work for James W. Queen & Company, a large manufacturer of scientific equipment. He distinguished himself at the age of 18 by designing a large induction coil that was cited at the World's Columbian Exposition of 1893. In 1897 he received a patent for a self-regulating x-ray tube. This tube was the first of its kind to solve the problem of an unstable output caused by a drop in tube gas pressure. At the outbreak of the Spanish–American War, he volunteered for military service and was assigned to Fort McPherson, Georgia where he was put in charge of the medical x-ray laboratory. After contracting typhoid fever he was di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philadelphia, Pennsylvania
Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and the urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions, with 6.245 million residents . The city's population at the 2020 census was 1,603,797, and over 56 million people live within of Philadelphia. Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's inde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
