Articles from The Science Of Fingerprints
How To Take Inked Fingerprints
Types Of Patterns
Classification Of Bandaged Or Imprinted Fingers
The Identification Division Of The Fbi
The Tented Arch
The Plain Whorl
The plain whorl consists of the simplest form of whorl construction
and is the most common of the whorl subdivisions. It is designated by
the symbol W for both general classification and extension purposes.
The plain whorl has two deltas and at least one ridge making a
complete circuit, which may be spiral, oval, circular, or any variant
of a circle. An imaginary line drawn between the two deltas must touch
or cross at least one of the recurving ridges within the inner pattern
area. A recurving ridge, however, which has an appendage connected
with it in the line of flow cannot be construed as a circuit. An
appendage connected at that point is considered to spoil the recurve
on that side.
Figures 194 to 211 are typical examples of the plain whorl type.
Figure 212 is, however, a loop, as the circuit is spoiled on one side
by an appendage.
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