  The sequence must be arranged properly at all times to make possible the most accurate work. Prints are sequenced and filed in this order, according to: I. Primary:
In the primary classification the denominator remains constant until all numerator figures have been exhausted from 1 to 32. All prints with the primary 1 over 1 are filed together. These are followed by 2 over 1, 3 over 1, 4 over 1, etc., until 32 over 1 is reached. The next primary is 1 over 2, then 2 over 2, etc., until 32 over 2 is reached. Eventually, through the use of each denominator figure and the elimination of each numerator over each denominator, the 32 over 32 primary will be reached. Even in the smaller collections of fingerprints, it will be found that the groups which are arranged under the individual primaries filed in sequence, from 1 over 1 to 32 over 32, will be too voluminous for expeditious searching. II. Secondary: A. Secondary small-letter group:
Most intricate of all the individual sequences is the small-letter sequence. It is less difficult if the following method is used: 1. Sequence according to the patterns in the index fingers, grouped
When small letters are present, there are 25 possible combinations which can appear in the index fingers. They are as follows: A T R U W - - - - - A A A A A A T R U W - - - - - T T T T T A T R U W - - - - - R R R R R A T U R W - - - - - U U U U U A T U R W - - - - - W W W W W 2. Within each group sequence: a. The denominator, by— (1) Count of the small letters (lesser preceding the greater). (2) Position of the small letters (those to the left preceding those to the right). (3) Type of small letter (sequence a, t, r). b. The numerator, by— (1) Count. (2) Position. (3) Type. Thus
The following table represents the full sequence of the denominator of the group having A over A in the index fingers. The full sequence as listed may be used as the numerator for each denominator as set out below. Following the group with A over A in the index fingers is the group with T over A in the index fingers, the sequence being the same otherwise. Then R over A, U over A, A over T to rW3r over rW3r.
B. Secondary loop and whorl group:
When no small letters are present, there are 9 possible combinations which can appear in the index fingers. They are as follows: At this point it is well to note that it may be preferable in some instances where small files are concerned to use only a portion of the classification formula in the filing sequence. In such cases, only those parts of the filing sequence which are necessary should be used along with the final and key. III. Subsecondary:
The sequence of the subsecondary is as follows: III IIM IIO IMI IMM IMO IOI --- --- --- --- --- --- --- III III III III III III III IOM IOO MII MIM MIO MMI MMM --- --- --- --- --- --- --- III III III III III III III MMO MOI MOM MOO OII OIM OIO --- --- --- --- --- --- --- III III III III III III III OMI OMM OMO OOI OOM OOO OOO, --- --- --- --- --- --- etc., to --- III III III III III III OOO each numerator in turn becoming the denominator for the complete sequence of numerators as listed above. IV. Major: The following sequence is used when loops appear in both thumbs: S M L S M L S M L - - - - - - - - - S S S M M M L L L When whorls appear in both thumbs the sequence is: I M O I M O I M O - - - - - - - - - I I I M M M O O O When a whorl appears in the right thumb and a loop in the left, the sequence is: I M O I M O I M O - - - - - - - - - S S S M M M L L L When a loop appears in the right thumb and a whorl in the left, the sequence is: S M L S M L S M L - - - - - - - - - I I I M M M O O O V. Second Subsecondary:
The sequence for filing the second subsecondary is as follows: SSS SSM SSL SMS SMM SML --- --- --- --- --- --- SSS SSS SSS SSS SSS SSS SLS SLM SLL MSS MSM MSL --- --- --- --- --- --- SSS SSS SSS SSS SSS SSS MMS MMM MML MLS MLM MLL --- --- --- --- --- --- SSS SSS SSS SSS SSS SSS LSS LSM LSL LMS LMM LML --- --- --- --- --- --- SSS SSS SSS SSS SSS SSS LLS LLM LLL, LLL, --- --- --- etc., to --- SSS SSS SSS LLL each group of the numerator becoming in turn the denominator for the complete sequence of numerators as listed above. VI. W C D X Extensions:
The sequence is as follows: Prints with c, d, or x in any finger other than the index fingers constitute the small-letter group. A sample of the sequence follows: W cWc xWd Wdx cW cWd xWx Wxc dW cWx W2c Wxd xW dWc Wcd W2x Wc dWd Wcx cW2c Wd dW Wdc cWcd Wx xWc W2d cWcx As may be readily seen, the sequence proceeds in the same fashion as the a, t, r, small-letter sequence. VII. Special Loop Extension used by the Federal Bureau of Investigation:
The following is a partial sequence for filing this extension: 111 112 113 114 115 116 117 --- --- --- --- --- --- --- 111 111 111 111 111 111 111 121 122 123 124 125 126 127 --- --- --- --- --- --- --- 111 111 111 111 111 111 111 131 132 133 134 135 136 137 --- --- --- --- --- --- --- 111 111 111 111 111 111 111 141 142 143 144 145 146 147 --- --- --- --- --- --- --- 111 111 111 111 111 111 111 151 152 153 154 155 156 157 --- --- --- --- --- --- --- 111 111 111 111 111 111 111 161 162 163 164 165 166 167 --- --- --- --- --- --- --- 111 111 111 111 111 111 111 171 172 173 174 175 176 177 777. --- --- --- --- --- --- --- etc., to --- 111 111 111 111 111 111 111 777 No matter how many of these divisions may be used, the order should remain the same; and no matter how many of these divisions are used, each individual group should be sequenced by: VIII. Final: Filed in numerical sequence from 1 out. For example, assume that there are 15 prints in a group having a final of 14. All of these should be filed together and followed by those prints in the same group having a final of 15, etc. IX. Key: All prints appearing in a designated final group are arranged by key in numerical sequence from 1 out. For example, assume that there are 5 prints in a group having a key of 14. All of these should be filed together and followed by those prints in the same group having a key of 15, etc. |
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