Part of a roller coaster ride

Usage examples of loops.

Nothing, I think, has played a part more exciting than that enacted by the fascinating loops, whorls, and arches etched on the fingers of a human being.

This is not important, however, as the only patterns in which we need to define the pattern area for classification purposes are loops and whorls.

The two loops are considered one, with one rod, the core being placed at C.

The ridge A within the pattern area recurves or loops, passing the imaginary line between the delta and the core, and tends to terminate toward the same side of the impression from whence it entered.

On the other hand, there are many patterns which at first sight resemble tented arches but which on close inspection are found to be loops, as where one looping ridge will be found in an almost vertical position within the pattern area, entirely free from and passing in front of the delta.

The two loops may be connected by an appending ridge provided that it does not abut at right angles between the shoulders of the loop formation.

The pattern is unusual because the loops are side by side and flowing in the same direction.

It is unusual because the loops are juxtaposed instead of one flowing over the other, and one delta is almost directly over the other.

The patterns referred to are usually double loops, though accidental whorls and loops sometimes present the same problems.

Figures 342 and 343 would be double loops, and illustration 344, a loop.

Ulnar loops in any finger are designated by a diagonal line slanting in the direction of the loop.

This is accomplished by grouping according to the ridge counts of loops and the ridge tracings of whorls.

Where loops appear in the thumbs, however, a table is used to translate the ridge counts into the small, medium, or large groups, designated by the letters S, M, L.

If no loops appear in the little fingers, a whorl may be used to obtain a final, counting from left delta to core if in the right hand and from right delta to core if in the left hand.

Where loops of a double loop are horizontal, the nearest core is used.