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.
Learning how to use a Smart Board in the classroom does not have to be difficult, as long as teachers understand that good teaching is still the most important thing in the classroom. Smart Boards have been making their way into classrooms since 1991, and have proven themselves as effective teaching tools.ust as they did before the advent of the Smart Board, teachers must determine what their classes need to learn, and how best to teach that information. As long as a foundation of good, solid teaching is established, the teacher can work in any tool that is helpful to accomplish his or her goal.