Procedure in classifying a set of prints

# Procedure in classifying a set of prints

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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