............................................... 9 References......................................................................................................................10 2 Frederick Douglas Frederick Douglass (February 17, 1818 February 20, 1895) was an American abolitionist, editor, orator, author, statesman and reformer. Called "The Sage of Anacostia" and "The Lion of Anacostia," Douglass was one of the most prominent figures of African American history during the 1800s, and one of the most influential lecturers and authors in American history. Douglass was a firm believer in the equality of all people, whether black, female, American Indian, or recent immigrant. He spent his entire life advocating the brotherhood of all humankind. One of his favorite quotations was: "I would unite with anybody to do right and with nobody to do wrong."
46471029,d. ZWU&psig=AFQjCNHyObAEOoJVxwtIHNPD_vap4JG2AA&ust=1368606565168026 · 1924 kasutab John Logie Baird (1888 1946) Londonis oma eksperimentaalse teleülekande jaoks Nipkowi ketast, avaliku demonstratsiooni teeb ta 25. Märtsil 1925. Pilt taastekitati osaliselt mehaaniliselt. 1925. aasta 13. juunil teeb Charles F. Jenkins esimese "raadiovisiooni" avaliku demonstratsiooni (first public demonstration of radiovision). Teleülekanne tehakse 5 miili kauguselt (USA-s, mereväe Anacostia raadiojaamast Washingtoni), telepilt on sünkroniseeritud heliga ja koosneb 48-st reast. Ta patenteeris oma leiutise 1926 aastal ja patendi number oli __ . · 1926 käivitas John Logie Baird Londonis TV süsteemi, mis edastas 5 kaadrit sekundis, kaader koosnes 30-st reast. · 1927. a. jaanuaris katsetas AT&T elektroonilist pilditekitamist. Telepilt koosnes 185- st reast. · 1927 lisatakse filmile sünkroniseeritud heli. Heli on filmis õigeaegselt käimas.
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