Rule for the Ridge Count for Key Classification When counting the ridges of the whorl on the thumb of the right hand, the count is form the left delta to the core. This count is to obtain the key classification. Formula for Fingerprint Classification Classification - the classification of fingerprints is the method by which filing and searching for the purpose of comparing prints are facilitated. Classification Formula – the classification formula is the result of combining all the patterns of the fingerprints and recording them, in a specific order and manner, at the top right of the fingerprint card Components of ClassificationThe classification formula is composed of seven possible divisions: Primary Secondary Sub-secondary Major Second sub-secondary Final; and Key Order of Designation in the Classification Line The classification formula is written horizontally on the fingerprint card. The components appear in the following sequence : Prepared by: Polzkey Page 6
Key Major Primary Secondary Sub-secondary Second sub-secondary; and Final Components of Formula Like a fraction, the classification formula has two parts a denominator, written below the line, and a numerator, written above the line. Blocking fingerprints Blocking fingerprints – means designating bysymbols the type of pattern which each finger and thumb bears and recording these symbols on the fingerprint card in the block provided for each respective finger and thumb. The rules of blocking fingerprints are: The symbols indicating the pattern type are marked at the bottom of each block. The ridge count of tracing is marked at the top and to the right, inside each block in which a loop or a whorl appears. In most bureaus, the ulnar loop ( and in some, the radial loop) is indicated by a diagonal line slanting in the direction of the loop; the diagonal line replaces the letter indication in all fingers except the index finger. The ulnar loop in the right hand is shown by a diagonal line from left to right; an ulnar loop in the left hand is shown by a diagonal line from the right to left. For the index fingers, the patterns are indicated by the appropriate capital letters. This is to avoid misinterpreting the diagonal line. For all other fingers and thumbs, when plain or tented arches and radials appear, the patterns are indicated by the corresponding small letter. The symbols used in blocking print are as follows: Pattern Index Finger Other Fingers Plain Arch A a Tented arche T t Radial loop R r Ulnar loop U / or \ PRIMARY CLASSIFICATION Primary Classification means - thesum of all numerical values of theories andcomposites in a set of fingerprints plus the fraction of one over one.
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