MAGNIFICATION OF BREAD AND STEEL - 1940S CU magnification of a slice of bread. Zoom in on a man's eye, which fades into a microscope's lens magnifying the crystal structure of steel and iron. Also exists on HD.
MICROSCOPIC PRECISION OF PARTS - 1940S Montage of metallic parts and gauges that enable precise measurements. Demonstration of a scleroscope that tests the hardness and toughness of metal. Available in HD.
MEASURING FRACTIONS OF SPACE - 1940S A microscopic look at the cutting edge of a pair of scissors. The residue of salt in boiled water "can be detected when [it] is burned and a picture is taken with a spectograph." Also exists on HD.
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