Classification and uses of finger prints / by Sir E.R. Henry.

  • Edward Henry
Date:
1913
Catalogue details

Licence: In copyright

Credit: Classification and uses of finger prints / by Sir E.R. Henry. Source: Wellcome Collection.

    102/168 page 92
    figures, and the above formula? would then become Si (4) or gj (t)> w^ere the figures in brackets denote the groups formed under classification numbers | and Amongst themselves these groups are dis- posed as follows : (t ), (I) i (~r)’and then G ), ( ~)> and s° °n- Ridge tracing in all four fingers is used for •splitting up into groups the accumulations under ^ • Jg ; Is > if ! si 1 and applicable to some others when the number of their slips is sufficiently large to necessitate further subdividing:. In Central Pockets, Lateral Pockets, Twinned Loops, most Accidentals, and in a fair proportion •of Whorls, the differentiation into I, M, 0 can be made at a glance. It is only when the Whorl has ■symmetrically disposed deltas, that is deltas which appear to be at almost the same distance from the ■core, that careful tracing is needed. The labour •entailed by noting Whorls as I, M, or 0 consequently is much less than might seem probable, and after a little practice will be found to have no special difficulties. Cases will occur where, owing to the imperfections of the print, it is not possible to decide with certainty, and in such instances double search is made. Thus, if it is doubtful whether a particular Whorl is I or M, search is made on the assumption first that it is I, and if this fails, search is made on the assumption that it is M. Classification of damaged or missing fingers.—It is essential that the slips accepted for
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