INSTRUCTIONAL TECHNOLOGY 3(2+1)

Lesson 26 : Projected Visual Aids

Transparences

Variety of transparent materials is available

• Acetate sheets in rolls and 10’’*10’’ cut
• Cellophane paper available in assorted colours
• Waste materials like new cloth transparent wrappers
• Used x-ray sheets after removing the emulsion with potassium ferricinide and sodium theosulphate in equal quantity of 50 % solution. Strong household soda used
• Any transparent plastic papers.

Types of transparencies:

1. Hand written/drawn
2. Typed transparency
3. Overly transparency
4. Cut outs
5. Picture transfer process
6. Xerox copying
7. Mounting and masking of over head transparencies