Overhead projector

Describes briefly the operation of the overhead projector and demonstrates its numerous uses, especially in classroom situations. Shows a variety of materials that can be used and the different methods of preparing them, including drawing and writing on transparent materials, and using carbon backed film and cut-outs. Demonstrates the preparation of diazo transparencies (dry ammonia process) and the use of autopositive paper. Stresses that the overhead projector can be used to meet the need or faster and better learning.