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Mystery: February 23, 2011 Issue [#4246]

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Mystery


 This week: Leaving your mark.... (Fingerprints)
  Edited by: The Milkman Author IconMail Icon
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Table of Contents

1. About this Newsletter
2. A Word from our Sponsor
3. Letter from the Editor
4. Editor's Picks
5. A Word from Writing.Com
6. Ask & Answer
7. Removal instructions

About This Newsletter

Once again I'm back to teach how to leave your mark on your Mystery readers.


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Letter from the editor

In my last newsletter I told you about how the fingerprints were discovered and the history of how they were used. The next obvious step is to tell you about the prints on the end of everyone's fingers. Before I get in under your skin, I'm going to break a myth. Throughout the course of your life your fingerprints do not change. A person can not change or conceal their fingerprints by sanding or burning away their prints. Sanded prints will reveal the original prints patterns and permanent fingerprints, which are still unique to that person. The vast majority of burned or scarred fingerprints still exhibit some or all the original print patterns.

The identifiable characteristics of fingerprint patterns are as follows and due to the difficulty I had of locating pictures that I could scan and place on this newsletter I will link a website below.

• Delta: the point on a ridge that's on or is nearest to the point of the divergence of two lines.
• Divergence: the point where two parallel lines begin to separate.
• Core: the center or approximate center of a fingerprint pattern.
• Comparison: matching the similarities and differences of the ridge patterns of two fingerprints patterns.
• Bifurcation: a forking or dividing of one line (ridges or grooves) into two individual lines, which appears like a fork in the roadway.
• Common: a ridge that runs in a continuous line with no breaks.
• "T" junction: the point where a ridge ends at another ridge that runs at an angle to the first ridge, forming a "T" intersection.
• Dot: a tiny ridge that looks like a small dot or period.
• Row of dots: a continuous line of two or more dots.
• Trifurcation: occurs when a ridge divides into three separate ridges.

In easily identifying matching patterns the prints are divided into groups of arches, loops and whorls.

Arches are ridgelines that rise in the center to create a wavelike pattern. Arches are subgrouped into plain and tented varieties. Tented arches have a sharper central rise than do plain arches. Only 5 percent of all pattern types are arches.

Loops are comprised of one or more ridges that double back on themselves. About 60 percent of patterns in human fingerprints are loops,. They're subdivided into two types depending upon the ridges flow in relation to the two bones of the forearm-- radius and the ulna:
Radial loops flow downward and toward the radius of the thumb side.
Ulnar loops flow toward the ulna or the little finger side.

Whorls look like whirlpools of ridgelines. They make up 35 percent of the patterns seen in human fingerprints and are subgrouped into four catergories:
Plain whorls are either concentri circles like a bull's eye or spirals like a wound spring.
Central pocket loop whorls resemble a loop with a whorl at its end.
Double loop whorls include two loops that collide to produce a S-shaped pattern,
Accidental loop whorls are slightly different from the other whorls and are irregular.




http://www.reachoutmichigan.org/funexperiments/agesubject/lessons/prints.html#ba...


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