Henry Classification
Definition
Numeric filing system built at the Calcutta Fingerprint Bureau in 1897. Assigns a numerator and denominator from whorls on even and odd numbered fingers, generating up to 1024 primary groups.
- Origin
- Calcutta Fingerprint Bureau, 1897
- Basis
- Whorl pattern presence on even- and odd-numbered fingers
- Output
- Numerator/denominator fraction, up to 1024 primary groups
- Key contributors
- Edward Henry with Azizul Haque and Hem Chandra Bose
- Status
- Superseded operationally by AFIS but still taught as classification theory
Common questions
Why does the Henry system use a numerator and a denominator?+
Each of the ten fingers is assigned a fixed point value only if it shows a whorl pattern. Even-numbered fingers sum into the numerator and odd-numbered fingers into the denominator, so the resulting fraction encodes which fingers carry whorls without needing to store the full print for a first-pass sort.
Is the Henry classification still used in modern fingerprint labs?+
Rarely for live casework since automated fingerprint identification systems search minutiae directly, but the primary-group logic still underlies how legacy paper archives are organised and is taught because it explains how manual ten-print filing scaled before computers.
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- Core
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- Delta
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- Dermal Papillae
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