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Extensions

The second subsecondary classification: When a group of fingerprints becomes so large that it is cumbersome and unwieldy, even though fully extended, it can be subdivided further by using a second subsecondary division, which is brought up into the classification formula directly above the subsecondary, and for which the symbols S, M and L are used. The following table is used:

IndexMiddleRing
1 to 5, inclusive, S.1 to 8, inclusive, S.1 to 10, inclusive, S.
6 to 12, inclusive, M.9 to 14, inclusive, M. 11 to 18, inclusive, M.
13 or more, L.15 or more, L.19 or more, L.

If this table is referred to, a study of [figure 352] will demonstrate the use of the second subsecondary.

WCDX extension: In the extension used in the Federal Bureau of Investigation for the large whorl groups, the type of whorl is designated by the symbols W, C, D, or X for the index fingers and w, c, d, or x for all other fingers, according to its classification as defined in figure 354. These symbols are used for subclassification purposes only and are brought up into the classification formula directly above the subsecondary in their respective positions, the right hand being the numerator, the left hand being the denominator.

[Fig. 354]

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Special loop extension: In the all-loop group