1 / 16

Fingerprints

What do you know about …. Fingerprints. Fingerprint video. T. Trimpe 2006 http://sciencespot.net. Fingerprint Principles. According to criminal investigators, fingerprints follow 3 fundamental principles:

rburgos
Download Presentation

Fingerprints

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. What do you know about … Fingerprints Fingerprint video T. Trimpe 2006 http://sciencespot.net

  2. Fingerprint Principles According to criminal investigators, fingerprints follow 3 fundamental principles: • A fingerprint is an individual characteristic; no two people have been found with the exact same fingerprint pattern.

  3. A fingerprint pattern will remain unchangedfor the life of an individual. • (However, the print itself may change due to permanent scars and skin diseases.)

  4. Fingerprints have general characteristic ridge patterns that allow them to be systematically identified.

  5. Fingerprint Classes There are 3 specific classes for all fingerprints based upon their visual pattern: arches, loops, and whorls. Each group is divided into smaller groups as seen in the lists below. Arch Plain Tented Loop Radial Ulnar Whorl Plain Central pocket Double loop Accidentical

  6. Interesting Info Fingerprint Factoid: 60% of people have loops, 35% have whorls, and 5% have arches Did you know? Dactyloscopy is the study of fingerprint identification. Police investigators are experts in collecting “dactylograms”, otherwise known as fingerprints.

  7. Spike or “tent” Plain Arch Ridges enter on one side and exit on the other side. Tented Arches Similar to the plain arch, but has a spike in the center. Arches Arches are the simplest type of fingerprints that are formed by ridges that enter on one side of the print and exit on the other. No deltas are present.

  8. Loops Loops must have one delta and one or more ridges that enter and leave on the same side. These patterns are named for their positions related to the radius and ulna bones. Delta RadialLoop (Right Thumb) Loop opens toward thumb or the radius bone. Ulnar Loop (Right Thumb) Loop opens toward the pinky or the ulna bone. NOTE: On the left hand, a loop that opens to the left would be an ulnar loop, while one that opens to the right would be a radial loop.

  9. Hold your right hand with palm facing you. RadialLoop (Right Thumb) Ulnar Loop (Right Thumb) Ulna Radius

  10. Whorls Whorls have at least one ridge that makes (or tends to make) a complete circuit. They also have at leasttwo deltas. If a print has more than two deltas, it is most likely an accidental. Central Pocket Whorl Plain Whorl Draw a line between the two deltas in the plain and central pocket whorls. If some of the curved ridges touch the line, it is a plain whorl. If none of the center core touches the line, it is a central pocket whorl.

  11. Double Loop Whorl Accidental Whorl Double loop whorls are made up of any two loops combined into one print. Accidental whorls contain two or more patterns (not including the plain arch), or does not clearly fall under any of the other categories. Delta Delta Whorls – Part 2

  12. Did you know? The koala is one of the few mammals (other than primates) that has fingerprints. In fact, koala fingerprints are remarkably similar to human fingerprints; even with an electron microscope, it can be quite difficult to distinguish between the two.

  13. Identify each fingerprint pattern. Whorl Whorl (Double Loop) ? Loop (Ulnar) A B Right Hand Left Hand Arch (Tented) Arch (Plain) C D Right Hand E Right Hand Left Hand

  14. It’s time to makesome prints! Avoid Partial Prints GOOD PRINTGet as much of the top part of your finger as possible!

  15. Directions 1– Roll the “pad” portion of your thumb over the ink pad from the left side of your thumb to the right. You do not have to push down really hard! 2– Roll the “pad” portion of your thumb from the left side of your thumb to the right in the correct box on your paper to make a thumbprint. 3– Use your notes and a magnifying lens to help you figure out what type of pattern is found in your fingerprints. Label your card with the pattern’s name.

  16. You try it! Work with your team to: 1- Match up the LETTERS with theNUMBERS (ex: A and 7) Write your answers at the BOTTOM of your worksheet. While you are working, Mrs. Redding will come around to take your fingerprints. If you don’t want to use the ink pad, use the magnifying glass to examine your prints and determine what type you have.

More Related