7:30 am - 12:00 am
Beseler Model OA3 Opaque Projector
Charles Beseler Company, New York, N.Y.
Opaque projectors, like the model OA3, were very popular with teachers
because they could projector a wide variety of materials, from graphics
to actual objects, without tedious preparatory work
Donated by Owatonna High School, 1988