The Science of Fingerprints: Classification and UsesUnited States. Federal Bureau of Investigation
Science
The Science of Fingerprints: Classification and Uses
United States. Federal Bureau of Investigation
Fingerprints
{ 1 to 11, inclusive, S (small).
12 to 16, inclusive, M (medium) { 12 to 16, inclusive, M (medium).
{ 17 or more ridges, L (large).
{ 1 to 17, inclusive, S (small).
17 or more ridges, L (large) { 18 to 22, inclusive, M (medium).
{ 23 or more ridges, L (large).
The fingerprint card appearing in figure 352 shows a major division of
L over L, which is obtained by counting the ridges (24 in the right
thumb and 18 in the left thumb) which, according to the table, is
translated into L in both thumbs.
THE FINAL: It is, of course, desirable to have a definite sequence or
order of filing the prints within the subdivided groups. This order is
attained through the use of the final, which is based upon the ridge
count of the loop in the right little finger. It is indicated at the
extreme right of the numerator in the classification. Note figure 352.
If a loop does not appear in the right little finger, a loop in the
left little finger may be used. It is then indicated at the extreme
right of the denominator (fig. 353). If no loops appear in the little
fingers, a whorl may be used to obtain a final, counting from left
delta to core if in the right hand and from right delta to core if in
the left hand. If there are two or more cores (usually applies to
accidental whorls), the ridge count is made from left delta (right
hand) or right delta (left hand) to the core which is the least
number of ridges distant from that delta. An exception is made in the
case of the double loop. The double loop is counted from the delta to
the core of the upright loop. Where loops of a double loop are
horizontal, the nearest core is used. Should both little fingers be a
or t, no final is used. The use of a whorl in a little finger for a
final is required only in connection with a large group or collection
of prints, such as the 32 over 32 primary.
[Illustration: 352]
Public-domain text, read in full here on John Shaqi.
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