3. 1900-THE PENCIL IS USUALLY FOUND IN THE
CLASSROOMS, IN THE OFFICE AND EVEN AT HOME.
4. 1905- STEREOSCOPE – THIS IS A THREE DIMENSIONAL VIEWING TOOL USED AS A
SOURCE OF ENTERTAINMENT AT HOME AND IN SCHOOL THAT WERE MEANT TO BE
USED TO ILLUSTRATE POINTS MADE DURING LECTURES.
5. 1920- RADIO . RADIO WAS USED FOR ON-AIR CLASSES WHICH
BEGAN POPPING UP FOR ANY STUDENT WITHIN LISTENING
RANGE.
6. IT IS ALSO CALLED MOVIE PROJECTOR WHICH IS USED
FOR PROJECTING MOVING IMAGE FROM FILM.