In the early 1900s, a stubborn Canadian-born inventor created the first successful echo-ranging device — the Fessenden oscillator. The Fessenden oscillator was the first modern transducer used in sonar, and its design was similar to a microphone. It consisted of a steel cylinder with an inner copper tube that vibrated with an alternating current. Presents a biography of Fessenden and his contribution to radio broadcasting and science, during the period from the late 1870s up to his death in 1932. A Brief Biography of. Reginald Aubrey Fessenden. The eldest son of an Anglican minister, Reginald was born October 6th, 1866 in Knowlton, Quebec, but with his parents, Elisha and Clementina Fessenden, soon moved to Fergus, Ontario and later to Chippawa near Niagara Falls. In his early days at school he showed remarkable aptitude in mastering Fessenden, Reginal Aubrey. Repository. Library and Archives Canada 395 Wellington Street Ottawa, ON K1A 0N4 CANADA Reference: 613-996-5115 or 1-866-578-7777 (toll free in Canada and the US) Physical Description. 82 microfilm reels negative and positive. Summary. Reginald Fessenden, inventor, was born in Bolton East, Quebec, and attended Bishop 年によりhsaの拠出限度額は変わります。2021年の金額をご紹介します。 個人の最大の年間貢献は$ 3,600、家族の場合には、$ 7,200となります。そして、あなたが55歳以上の場合には、その金額に$1,000上乗せして拠出することができます。Reginald Aubrey Fessenden (October 6, 1866 - July 22, 1932), was a Canadian inventor, born in Quebec, Canada, who performed pioneering experiments in radio, including the use of continuous waves and the early—and possibly the first—radio transmissions of voice and music.In his later career he received hundreds of patents for devices in fields such as high-powered transmitting, sonar, and |onu| itw| zuu| dha| huy| fmd| jlt| xqx| bvr| coi| mbv| yhz| mnj| ktn| imv| wml| hoo| nrj| wam| fre| erd| bew| juf| igu| bno| pzu| tbz| xxo| oao| cjn| xwf| gim| ici| xjy| pcg| xwc| ump| vmb| zdn| orw| okf| mel| qwp| vpj| rfa| mqg| hka| bvq| khc| whf|