Maximaxing the use of the overhead projector and the chalkboard

                                I understand that in teaching the teacher must have a self discipline regarding the use of materials in the classroom.
                             We all know that before the technology came out the most important material in teaching was the chalkboard and we cant deny the fact that some school using projector but for who's have a good handwriting, its not obviously deniable that we have to maximize it.
                               It is also important to know the use of some overhead projector so that we have the guts to teach to our students.
                              There are two overhead projection techniques this are overlaying and progressive disclosure technique. It is better to use overhead projector because we can save much time. Adopting them in our teaching spells visual and lasting learning for our students.