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The Henry System - Primary Classification The Henry Classification System is based on WHORLS or the lack thereof. The primary classification number is calculated in the form of a fraction. Each of the ten fingers are arranged so that five specific fingers are assigned a spot in the numerator (top) and the other five are assigned a place in the denominator (bottom.) Some people do not have whorls as fingerprints. Because of this, the number one is added to both the numerator and denominator. Division by zero is undefined in math and this act prevents that event from happening. Fingers placed in the numerator. Right Index Right Ring Left Thumb Left Middle Left Little Right Little Left Index Left Ring Fingers placed in the denominator. Right Thumb Right Middle ***NOTE: You will NOT have to memorize the position of the fingers. I will provide this information for you. You will only have to know how to fill in the value for each finger. The Henry system is set up as follows: TOTAL Right Right Left Index Ring Thumb 16 8 4 Right Thumb 16 Right Middle 8 Right Little 4 Left Middle 2 Left Little 1 Left Index 2 Left Ring 1 + + 1 1 It is easy to remember how to assign the value for each number if you can remember “Sweet 16.” Each number after that is obtained by dividing by 2. DON’T FORGET TO ADD AN ADDITIONAL 1 TO THE NUMERATOR AND THE DENOMINATOR!!!!!! Name _________________________________ Period ______ Date ______ The Henry System - Primary Classification EXAMPLE 1: You have a 10-print card and notice that the following fingers have WHORLS: Right ring, Left little, Right thumb, Right little, and the Left index. Circle those positions in the chart and mark out the remaining fingers that were determined NOT to have whorls. Right Index 16 Right Ring 8 Left Thumb 4 Left Middle 2 Left Little 1 Right Thumb 16 Right Middle 8 Right Little 4 Left Index 2 Left Ring 1 + 1 + 1 Now add the remaining numbers in the numerator and the denominator. DO NOT REDUCE THE ANSWER TO LOWEST TERMS!!!! 8 + 1 + 1 = 10 Your final answer = 16 + 4 + 2 + 1 = 23 10 23 EXAMPLE 2: Now you try: The following fingers were determined to contain whorls: Left thumb, Left middle, Left little, Left index, and Left ring. What is the Henry Classification number for this person? Right Index 16 Right Ring 8 Left Thumb 4 Left Middle 2 Left Little 1 1 Right Thumb 16 Right Middle 8 Right Little 4 Left Index 2 Left Ring 1 1 8 Did you get ? If so, you are correct. Again, remember not to reduce your answer! 4 PROBLEM 1: Now try this one, but you have to fill in the numbers…. This person has whorls on the Right ring, the left middle, the left little, the right middle and the right little. What is the Henry classification number? TOTAL Right Right Left Left Left Index Ring Thumb Middle Little Right Thumb 12 Did you get 10 Right Middle Right Little Left Index Left Ring ? PROBLEM 2: Here is the whole ten-print card for a suspect. What is the Henry Classification for this person? Left little = Plain Arch Right Little = Central Pocket Whorl Left ring = Accidental Whorl Right Ring = Plain Whorl Left middle = Ulnar Loop Right middle = Radial Loop Left index = Double-Loop Whorl Right index = Tented Arch Left thumb = Plain Whorl Right thumb = Radial Loop So, how did you do? Your answer: PROBLEM 3: 18 What if I told you that a person had a Henry Classification number of . 7 What fingers would have whorls? Show/Explain how you obtained your answer. (Hint: Subtract 1 from the numerator and then identify the numbers that add to give you 17. Do the same for the denominator.)