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.

    34/168 (page 24)
    Fixed points in impressions.—In impres- sions of the Loop, Whorl, and Composite types there are fixed points which, as will hereafter appear, sub- serve several useful purposes. These fixed points are : (1) The “ delta ” or “ outer terminus.” (2) The “ point of the core ” or “ inner terminus.” Delta; “Outer terminus.”—The “delta” here referred to may he formed either (a) by the bifurcation of a single ridge, or (b) by the abrupt divergence of two ridges that hitherto had run side by side. (a) Where the upper and lower sides of the “ delta ” are formed by the bifurcation of a single ridge, the point of bifur- cation forms the “ outer ter- minus,” marked X in Fig. 3. Where there are several such bifurcations, the one nearest the core is taken as the “ outer terminus.” (ib) The upper and lower sides of the “ delta ” may be formed by the abrupt diver- gence of two ridges which, up to this point, had run side by side. The nearest ridge in front of the place where the divergence begins, even if it be a mere point, and whether it is independent of or sprung from the diverging ridges or not, is the “ outer terminus,” marked Y in Fig. 4.