Project Tetard- Overhead Projector

 

Enhances- The overhead projector was an enhancement to the slide projector. The slide projector allows images to be displayed one at a time. The slide projectors were also difficult to use. The user had to put the slides in order and make sure they are inserted correctly. Due to slide projectors being difficult other forms of displaying images were developed.

http://www.wisegeek.com/what-is-a-slide-projector.htm

Obsolete- The development of the overhead made slide projectors obsolete because there was user friendly. Teachers started using the overhead projector to display images from transparencies. The overhead projector provided a low cost interactive experience for teachers. Teacher began to use the overhead to display information rather than writing it on the chalkboard. It saved teachers time because the transparence and information could be reuse several of times. The overhead also allowed for teachers to face their students when presenting information.

http://en.wikipedia.org/wiki/Overhead_projector

Retrieves- The overhead projector is similar to the 1600’s Magic Lantern/Laterna Magica, which projected an image on by inserting a slide into the lantern.

http://en.wikipedia.org/wiki/Magic_lantern

Reverses- The overhead projector became obsolete through the use of computers and LCD video displays used in the classrooms. Teachers no longer have to use transparence to display images to students. Information began to be displayed through computer programs such as Powerpoint, and information found online or on the computers hard drive.  Teachers are began to use interactive whiteboards, which allows the students and teachers to interact with the information that is being displayed.

http://en.wikipedia.org/wiki/Overhead_projector