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.

    44/168 (page 34)
    reversed for the left hand, where / = ulnar and \ = radial. li the impressions of Figs. 14 and 15 are those of left hand digits, they are ulnar Loops ; if of a right hand they are radial. Referring to the Illustrations,, if they are impressions of a right hand digit, 31, 32, 35, 37, 42, 46 are ulnar Loops, 30, 33, 34, 38, 39, 40 being radials. If they are impressions of a left hand,. 31, 32, 35, 37, 42, 46 would be radial, and 30, 33, 34, 38, 39, 40 would be ulnar. As it is essential to have this differentiation well understood, the point is dwelt upon. The terms ulnar and radial are borrowed from anatomy, the ulna and radius being the two bones of the fore- arm. Whorls.—In whorls some of the ridges make a turn through at least one complete circuit ; there are two deltas. Whorls are single cored or double cored (Figs. 18, 19, 20, 21, 22, 23). In Fig. 18 the ridge or stream A Y bifurcates at Y, the stream Y B making an upward turn before descending, while the stream Y C passes away towards the right side, this bifurcation causing the appear- ance of a delta at Y. On the right side of this same diagram the stream D Z, which flows from right to left, bifurcates at Z, causing the appearance of the delta there; the stream Z E at first flows upwards before taking a downward course, while the stream Z F, continuing in the direction of the parent stream D Z, passes away to the left. In Fig. 20 the ridges about the core are elliptical