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เนื้อหาย่อ : This presentation, dealing with the principles of basic television, is the outgrowth of three years of experimental revision of lessons used in both correspond nce and resident study in television courses at New York cal Institute. These courses, approved by the New York s Department of Education and approved for veteran training, included ensive study of radio and television theory. The examinations s submitted by the many thousands of civilian and veteran who utilized the original instructional material showed the maximum success to be in those areas of the curriculum that were highly pictorialized. faculty and industrial groups advising the Institute sugge development of a television theory course, reflecting the most modern visually oriented techniques, would be of great assistance to students and trainees in schools, for industrial training programs, and for home study. With visualization as one of the aims of the proposed project, the subject matter required to give complete up-to-date coverage of the television feld cted. Technical illustrations and related texts were then ested upon groups of students to be sure that they were c standable to every student. Alternative sketches and subj ment were devised and re-tested in most areas. The lesson materials that most succesful from the standpoint of rapid and complete lea he part of the trainees were selected to form the final complete