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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_Central pocket loop_

Within the whorl group, the subcla.s.sification type "central pocket loop" is used for extension purposes only. In general cla.s.sification it is designated by the letter "W". Figures 213 to 236 are central pocket loops.

_The central pocket loop type of 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 not touch or cross any 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 and on the delta side cannot be construed as a circuit. An appendage connected at that point is considered to spoil the recurve on that side._

_In lieu of a recurve in front of the delta in the inner pattern area, an obstruction at right angles to the line of flow will suffice._

It is necessary that the inner line of flow be fixed artificially.

_The inner line of flow is determined by drawing an imaginary line between the inner delta and the center of the innermost recurve or looping ridge._

In the central pocket loop, one or more of the simple recurves of the plain loop type usually recurve a second time to form a pocket within the loop. The second recurve, however, need not be a continuation of--or even connected with--the first. It may be an independent ridge.

If no second recurve is present, an obstruction at right angles to the inner line of flow is acceptable in lieu of it. An obstruction may be either curved or straight. A dot, of course, may not be considered an obstruction.

_The definition does not require a recurve to cross the line of flow at right angles. The angle test needs to be applied to obstructions only._

The recurve or obstruction of the central pocket loop, as that of the plain whorl, must be free of any appendage connected to it at the point crossed by the line of flow and on the delta side. An appendage at that point is considered to spoil the recurve or obstruction.

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