For the construction of our Polarization demonstration we began by locating an old overhead projector. This was not difficult since our school was remodeling and had a number of extra projectors. After this we located our materials including a 6 rpm 120 volt electric motor, a sheet of glass, cellophane, a disc polarizing filter as well as a sheet filter, and a mechanism made from plastic tube and washers to suspend the disc filter.

            We placed the filter beneath the glass and placed cellophane between the bottom sheet of glass and another sheet. We then mounted the motor above the lens of the projector with the small axel over the edge. The plastic tube was attached to the motor suspending the polarizing disc partially below the lens.

            By doing this, light would have to travel through the first polarizing sheet, then through the glass and cellophane, through the second polarizing sheet, and through the lens to the screen. The motor rotated the disc so that the patterns projected on the screen would continuously be in motion.