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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.