The first color television sets for this system were sold in 1954. They used a 15 inch screen. Later that year, 19 inch sets were made, and by 1955 all sets were made with a 21 inch picture tube.Several manufacturers made 15 and 19 inch sets, most in very small quantities.he most comprehensive website on early color history is by Ed Reitan. The first set was made by Westinghouse, and sold for $1295. RCA introduced the CT-100 a few weeks later, at a price of $1000. GE sold its 15 inch set for $1,000, Sylvania's cost $1,150.
When routines and procedures are carefully taught, modeled, and established in the classroom, children know whatâs expected of them and how to do certain things on their own. Having these predictable patterns in place allows teachers to spend more time in meaningful instruction.
It helps the student focus on the learning. 10. Use certain strategies for specific types of knowledge. While the first nine strategies work with almost all types of subject-matter knowledge, there are practices that are more related to a specific type of knowledge. Vocabulary terms and phrases, details and organizing ideas need to be taught, for instance.