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.

    49/168 page 39
    the standards, it will be noticed that this arrow if prolonged would meet at least one recurving ridge at right angles. This characteristic determines in doubtful cases whether an impression is a Loop or Central Pocket. These standards have been adopted to guide the eye, and because their employment often proves of assistance in at once deciding whether an impression is or is not a Central Pocket. Illustrations 71, 72, 73, 74 come under Standard I. ; in 75, 76, 77, 78 the axis meets ridges not at right angles but at an acute angle, and they moreover are converging not recurving edges, so these im- pressions are excluded from Central Pockets and classed as Loops. Illustrations 79, 80, 81 come under Standard II. In Illustrations 82. 83, 84, 85 the ridge or ridges meet the axis at an acute angle; these impressions are classified as Loops. Standard III. possesses characteristics which can at once be noticed when they exist in an im- pression. Standard IV. is the most comprehensive and most easily applied. The existence of even one ridge whose course is at right angles to the axis brings the impression under this standard. Illustra- tion 97 is a good example of this. There will occasionally occur cases in which the application of the rule may appear doubtful, and these must be treated as transitional, and when search is made it must be made first on the assumption that the impression is a Loop, and then on the assumption that it is a Composite ; but this will be more fully dealt with under Classification.
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