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Procedure in classifying a set of prints

Procedure in classifying a set of prints. 1. Determine the pattern of each finger of both thumbs 2. Block the prints by designating the respective symbols Blocking is the process of writing below each pattern the corresponding symbol of the fingerprint pattern in the space provided in the card

cora-briggs
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Procedure in classifying a set of prints

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  1. Procedure in classifying a set of prints • 1. Determine the pattern of each finger of both thumbs • 2. Block the prints by designating the respective symbols • Blocking is the process of writing below each pattern the corresponding symbol of the fingerprint pattern in the space provided in the card • Count and trace the pattern as applicable

  2. Obtain the primary classification • Summation of the numerical values of the whorl plus 1/1 • Denominator • Total numerical value of fingers in the odd fingers plus 1 • 1,3,5,7,9 • Numerator • Total numerical value of fingers in the even fingers plus 1 • 2,4,6,8,10

  3. Numerical Value 16 8 4 2 1 • Fingers • 1&2 • 3&4 • 5&6 • 7&8 • 9&10

  4. Indicate the secondary classification • Represents the type of pattern that appears in: • Index finger symbolized by capital letters • Thumb, middle and ring finger symbolized by small letters • Numerator-right hand • Denominator-left hand

  5. Plain Arch Tented Arch Radial Loop Ulnar Loop Plain Whorl Central Pocket Loop Accidental Whorl Double Loop Capital Letters • A • T • R • U • W • C • X • D

  6. Plain arch Tented arch Radial loop Small Letters • a • t • r

  7. Indicate the Sub-Secondary Classification • Designation of the ridge count and tracing in the index, middle and ring finger • In whorl patterns: • I (inner whorl)‏ • M (meeting/meet whorl)‏ • O (outer whorl)‏ • In arch patterns: • Represented by a dash (-)‏

  8. In loop patterns: • Represented by I (inner) and O (outer)‏ • Index finger Middle finger Ring finger • 1-9 = I 1-10 = I 1-13 = I • 10 above = O 11 above = O 14 above = O

  9. Indicate the major classification • Ridge counting the loops and ridge tracing the whorls appearing in the thumbs of both hands • Denominator-left thumb • Numerator-right thumb • If whorl patterns appear on both thumbs, use the symbol for ridge tracing • I (inner whorl)‏ • M(meeting/meet whorl)‏ • O (outer whorl)‏

  10. If the ridge count for the left thumb is 1-16 apply the table for both thumb: • 1-11 = S • 12-16 = M • 17 above = L • If the ridge count for the left thumb is above 17, apply the table for the right thumb: • 1-17 = S • 18-22 = M • 23 above = L

  11. If there is a combination of ridge tracing and counting applied, they are designated by respective symbols of SML and IMO

  12. Indicate the Final Classification • The ridge count of the loops and whorls appearing in both little fingers • Written at the extreme right of the classification formula • Denominator – left little finger • Numerator – right little finger

  13. Indicate the key classification • Derived by ridge counting the first loop • May come from the right thumb or any other finger except the little fingers • Written at the extreme left of the classification formula • If there is no loop, then the first whorl is treated as an ulnar loop for ridge counting • If there is no loop or whorl, a dash (-) is placed

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