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[[image - two negatives covered by white sheet of paper (back of the article in scan 42)]] human visual acuity cannot resolve such closely spaced lines. However, under unusually high magnification, one can observe a lenticular pattern 90[[degree sign]]F for prolonged periods of time. Be sure to use them before their expiration date. In no case should any Polaroid film be frozen. 8 [[end page]] [[start page]] Personal Notes [[on film]] Jones [[/on film]] [[image - blurry aerial view of building - perhaps on negative]] Denver, Co [[image - blurry picture of scaffolding]] [[image - black negative]] 9