World Trade Center Investigation
World Trade Center Investigation
Aug 25, 2021
nist.gov
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nistreview-NIST-FOIA-06-32-13-39-1-video
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Internet Archivenorwood
The tape measures that we use for everything from sewing to sports can trace their accuracy back to waves of light. Once manufacturers print their tapes, they check random samples for accuracy. They place the tape samples firmly along a flat bench and next to a microscope. A device called a laser interferometer, placed at one end of the bench, can precisely measure distances along the tape using a laser beam split in two. Each laser beam is a vibrating electromagnetic wave with peaks and valleys
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