Visual instruction--the use of interesting or clarifying objective illustrations such as specimens, maps, pictures, and the like--are as old as formal instruction or what is now thought of as organized education. In recent years, however, new visual mediums or aids have been introduced into instructional practices, many of which have a special…

Educational television has made great strides in the five years which have elapsed since the Federal Communications Commission set aside television channels for the exclusive use of education. Such stations are located in 29 communities of the United States, representing large cities, university centers and, in several instances, serving entire…