A protector adapted to accommodate a transparency inserted therein in a moist state, the transparency drying out while in the protector and being thereafter maintained in clean, dust free and dry condition so that it is useable with an overhead optical projector which casts {TAIL ~ the image} carried by {HEAD ~ the transparency} onto a viewing screen 
A protector adapted to accommodate a transparency inserted therein in a moist state , the transparency drying out while in the protector and being thereafter maintained in clean , dust free and dry condition so that it is useable with an overhead optical projector which casts { TAIL ~ the image } carried by { HEAD ~ the transparency } onto a viewing screen
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