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wrote a paper describing the patterns that he saw on the human hand under the microscope.
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described nine distinct fingerprint patters, including loops, spirals, circles, and double whorls. -
He noted the patterns were unique to each person and were not altered by age.
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created a way to identify criminals
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verified that fingerprints do not change with age and developed the classification system for fingerprints that are still in use today in the US and Europe.
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improved the fingerprint collection/ He divided his own fingerprint classification system and invented a better way of collecting the impressions.
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created a system that divided fingerprint records into groups based on whether they have an arch, work, or loop pattern. 10 card system
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